915136391 has 4 divisors (see below), whose sum is σ = 985531512. Its totient is φ = 844741272.

The previous prime is 915136381. The next prime is 915136427. The reversal of 915136391 is 193631519.

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

It is a cyclic number.

It is not a de Polignac number, because 915136391 - 2¹⁰ = 915135367 is a prime.

It is a super-2 number, since 2×915136391² = 1674949228265009762, which contains 22 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 (915136301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35197541 + ... + 35197566.

It is an arithmetic number, because the mean of its divisors is an integer number (246382878).

Almost surely, 2^915136391 is an apocalyptic number.

915136391 is a deficient number, since it is larger than the sum of its proper divisors (70395121).

915136391 is a wasteful number, since it uses less digits than its factorization.

915136391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70395120.

The product of its digits is 21870, while the sum is 38.

The square root of 915136391 is about 30251.2213141883. The cubic root of 915136391 is about 970.8719233389.

The spelling of 915136391 in words is "nine hundred fifteen million, one hundred thirty-six thousand, three hundred ninety-one".