915919819369 has 3 divisors (see below), whose sum is σ = 915920776407. Its totient is φ = 915918862332.

The previous prime is 915919819337. The next prime is 915919819379. The reversal of 915919819369 is 963918919519.

The square root of 915919819369 is 957037.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 620431905625 + 295487913744 = 787675^2 + 543588^2 .

It is not a de Polignac number, because 915919819369 - 2⁵ = 915919819337 is a prime.

It is a super-2 number, since 2×915919819369² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 915919819298 and 915919819307.

It is not an unprimeable number, because it can be changed into a prime (915919819379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 478519 + ... + 1435555.

It is an arithmetic number, because the mean of its divisors is an integer number (305306925469).

Almost surely, 2^915919819369 is an apocalyptic number.

915919819369 is the 957037-th square number.

915919819369 is the 478519-th centered octagonal number.

It is an amenable number.

915919819369 is a deficient number, since it is larger than the sum of its proper divisors (957038).

915919819369 is an frugal number, since it uses more digits than its factorization.

915919819369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914074 (or 957037 counting only the distinct ones).

The product of its digits is 42515280, while the sum is 70.

The spelling of 915919819369 in words is "nine hundred fifteen billion, nine hundred nineteen million, eight hundred nineteen thousand, three hundred sixty-nine".