915591 has 8 divisors (see below), whose sum is σ = 1285120. Its totient is φ = 578232.

The previous prime is 915589. The next prime is 915601. The reversal of 915591 is 195519.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 915591 - 2¹ = 915589 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 (915191) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7975 + ... + 8088.

It is an arithmetic number, because the mean of its divisors is an integer number (160640).

2⁹¹⁵⁵⁹¹ is an apocalyptic number.

915591 is a deficient number, since it is larger than the sum of its proper divisors (369529).

915591 is a wasteful number, since it uses less digits than its factorization.

915591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16085.

The product of its digits is 2025, while the sum is 30.

The square root of 915591 is about 956.8651942672. The cubic root of 915591 is about 97.1032662238.

The spelling of 915591 in words is "nine hundred fifteen thousand, five hundred ninety-one".