961620099 has 16 divisors (see below), whose sum is σ = 1399351680. Its totient is φ = 582536960.

The previous prime is 961620089. The next prime is 961620103. The reversal of 961620099 is 990026169.

It is a happy number.

It is a Cunningham number, because it is equal to 31010²-1.

It is a cyclic number.

It is not a de Polignac number, because 961620099 - 2⁴ = 961620083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 961620099.

It is not an unprimeable number, because it can be changed into a prime (961620029) 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, 87859 + ... + 98195.

It is an arithmetic number, because the mean of its divisors is an integer number (87459480).

Almost surely, 2^961620099 is an apocalyptic number.

961620099 is a deficient number, since it is larger than the sum of its proper divisors (437731581).

961620099 is a wasteful number, since it uses less digits than its factorization.

961620099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13170.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 961620099 is about 31009.9999838762. Note that the first 4 decimals coincide. The cubic root of 961620099 is about 987.0394494836.

The spelling of 961620099 in words is "nine hundred sixty-one million, six hundred twenty thousand, ninety-nine".