961761621 has 16 divisors (see below), whose sum is σ = 1358510400. Its totient is φ = 603134208.

The previous prime is 961761601. The next prime is 961761623. The reversal of 961761621 is 126167169.

961761621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 961761621 - 2⁶ = 961761557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 961761621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961761623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121575 + ... + 129243.

It is an arithmetic number, because the mean of its divisors is an integer number (84906900).

Almost surely, 2^961761621 is an apocalyptic number.

It is an amenable number.

961761621 is a deficient number, since it is larger than the sum of its proper divisors (396748779).

961761621 is a wasteful number, since it uses less digits than its factorization.

961761621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10148.

The product of its digits is 27216, while the sum is 39.

The square root of 961761621 is about 31012.2817767413. The cubic root of 961761621 is about 987.0878681002.

The spelling of 961761621 in words is "nine hundred sixty-one million, seven hundred sixty-one thousand, six hundred twenty-one".