10915591 has 4 divisors (see below), whose sum is σ = 10989000. Its totient is φ = 10842184.

The previous prime is 10915517. The next prime is 10915607. The reversal of 10915591 is 19551901.

10915591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10915591 - 2¹⁷ = 10784519 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 (10915991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36481 + ... + 36778.

It is an arithmetic number, because the mean of its divisors is an integer number (2747250).

Almost surely, 2^10915591 is an apocalyptic number.

10915591 is a deficient number, since it is larger than the sum of its proper divisors (73409).

10915591 is an equidigital number, since it uses as much as digits as its factorization.

10915591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73408.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 10915591 is about 3303.8751489728. The cubic root of 10915591 is about 221.8276873527.

The spelling of 10915591 in words is "ten million, nine hundred fifteen thousand, five hundred ninety-one".