1915882061 has 4 divisors (see below), whose sum is σ = 1917709500. Its totient is φ = 1914054624.

The previous prime is 1915882051. The next prime is 1915882063. The reversal of 1915882061 is 1602885191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 789272836 + 1126609225 = 28094^2 + 33565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1915882061 - 2²⁶ = 1848773197 is a prime.

It is a super-3 number, since 3×1915882061³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1915882063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912146 + ... + 914243.

It is an arithmetic number, because the mean of its divisors is an integer number (479427375).

Almost surely, 2^1915882061 is an apocalyptic number.

It is an amenable number.

1915882061 is a deficient number, since it is larger than the sum of its proper divisors (1827439).

1915882061 is a wasteful number, since it uses less digits than its factorization.

1915882061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827438.

The product of its (nonzero) digits is 34560, while the sum is 41.

The square root of 1915882061 is about 43770.7900431326. The cubic root of 1915882061 is about 1242.0037973457.

The spelling of 1915882061 in words is "one billion, nine hundred fifteen million, eight hundred eighty-two thousand, sixty-one".