915891487 has 12 divisors (see below), whose sum is σ = 1111748976. Its totient is φ = 750916320.

The previous prime is 915891479. The next prime is 915891499. The reversal of 915891487 is 784198519.

It is not a de Polignac number, because 915891487 - 2³ = 915891479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915891467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405214 + ... + 407467.

It is an arithmetic number, because the mean of its divisors is an integer number (92645748).

Almost surely, 2^915891487 is an apocalyptic number.

915891487 is a deficient number, since it is larger than the sum of its proper divisors (195857489).

915891487 is a wasteful number, since it uses less digits than its factorization.

915891487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812718 (or 812711 counting only the distinct ones).

The product of its digits is 725760, while the sum is 52.

The square root of 915891487 is about 30263.6991625280. The cubic root of 915891487 is about 971.1388780696.

The spelling of 915891487 in words is "nine hundred fifteen million, eight hundred ninety-one thousand, four hundred eighty-seven".