961856565 has 16 divisors (see below), whose sum is σ = 1552592448. Its totient is φ = 508449536.

The previous prime is 961856557. The next prime is 961856579. The reversal of 961856565 is 565658169.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 961856565 - 2³ = 961856557 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282039 + ... + 285428.

It is an arithmetic number, because the mean of its divisors is an integer number (97037028).

Almost surely, 2^961856565 is an apocalyptic number.

It is an amenable number.

961856565 is a deficient number, since it is larger than the sum of its proper divisors (590735883).

961856565 is a wasteful number, since it uses less digits than its factorization.

961856565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567588.

The product of its digits is 1944000, while the sum is 51.

The square root of 961856565 is about 31013.8124873418. The cubic root of 961856565 is about 987.1203484241.

The spelling of 961856565 in words is "nine hundred sixty-one million, eight hundred fifty-six thousand, five hundred sixty-five".