961515618 has 16 divisors (see below), whose sum is σ = 2197750080. Its totient is φ = 274718736.

The previous prime is 961515617. The next prime is 961515629. The reversal of 961515618 is 816515169.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 22893229 = 961515618 / (9 + 6 + 1 + 5 + 1 + 5 + 6 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 961515618.

It is not an unprimeable number, because it can be changed into a prime (961515617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11446573 + ... + 11446656.

It is an arithmetic number, because the mean of its divisors is an integer number (137359380).

Almost surely, 2^961515618 is an apocalyptic number.

961515618 is an abundant number, since it is smaller than the sum of its proper divisors (1236234462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

961515618 is a wasteful number, since it uses less digits than its factorization.

961515618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22893241.

The product of its digits is 64800, while the sum is 42.

The square root of 961515618 is about 31008.3153041245. The cubic root of 961515618 is about 987.0037005761.

The spelling of 961515618 in words is "nine hundred sixty-one million, five hundred fifteen thousand, six hundred eighteen".