961813591 has 2 divisors, whose sum is σ = 961813592. Its totient is φ = 961813590.

The previous prime is 961813579. The next prime is 961813613. The reversal of 961813591 is 195318169.

961813591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 961813591 - 2¹⁵ = 961780823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961813561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480906795 + 480906796.

It is an arithmetic number, because the mean of its divisors is an integer number (480906796).

Almost surely, 2^961813591 is an apocalyptic number.

961813591 is a deficient number, since it is larger than the sum of its proper divisors (1).

961813591 is an equidigital number, since it uses as much as digits as its factorization.

961813591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The square root of 961813591 is about 31013.1196592668. The cubic root of 961813591 is about 987.1056472919.

The spelling of 961813591 in words is "nine hundred sixty-one million, eight hundred thirteen thousand, five hundred ninety-one".