961303591 has 6 divisors (see below), whose sum is σ = 970215792. Its totient is φ = 952472520.

The previous prime is 961303531. The next prime is 961303597. The reversal of 961303591 is 195303169.

It is not a de Polignac number, because 961303591 - 2²⁵ = 927749159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 961303591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961303597) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28575 + ... + 52336.

It is an arithmetic number, because the mean of its divisors is an integer number (161702632).

Almost surely, 2^961303591 is an apocalyptic number.

961303591 is a deficient number, since it is larger than the sum of its proper divisors (8912201).

961303591 is an equidigital number, since it uses as much as digits as its factorization.

961303591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81129 (or 81020 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 961303591 is about 31004.8962423679. The cubic root of 961303591 is about 986.9311460888.

The spelling of 961303591 in words is "nine hundred sixty-one million, three hundred three thousand, five hundred ninety-one".