915993261 has 6 divisors (see below), whose sum is σ = 1323101390. Its totient is φ = 610662168.

The previous prime is 915993241. The next prime is 915993271. The reversal of 915993261 is 162399519.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 810540900 + 105452361 = 28470^2 + 10269^2 .

It is not a de Polignac number, because 915993261 - 2¹⁰ = 915992237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915993241) 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 5 ways as a sum of consecutive naturals, for example, 50888506 + ... + 50888523.

Almost surely, 2^915993261 is an apocalyptic number.

It is an amenable number.

915993261 is a deficient number, since it is larger than the sum of its proper divisors (407108129).

915993261 is a wasteful number, since it uses less digits than its factorization.

915993261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101777035 (or 101777032 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 915993261 is about 30265.3805692246. The cubic root of 915993261 is about 971.1748477701.

The spelling of 915993261 in words is "nine hundred fifteen million, nine hundred ninety-three thousand, two hundred sixty-one".