9565613981 has 12 divisors (see below), whose sum is σ = 12016309536. Its totient is φ = 7453724520.

The previous prime is 9565613929. The next prime is 9565614007. The reversal of 9565613981 is 1893165659.

It is not a de Polignac number, because 9565613981 - 2²⁶ = 9498505117 is a prime.

It is a super-2 number, since 2×9565613981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9565610981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5645915 + ... + 5647608.

It is an arithmetic number, because the mean of its divisors is an integer number (1001359128).

Almost surely, 2^9565613981 is an apocalyptic number.

It is an amenable number.

9565613981 is a deficient number, since it is larger than the sum of its proper divisors (2450695555).

9565613981 is a wasteful number, since it uses less digits than its factorization.

9565613981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11293552 (or 11293541 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 53.

The square root of 9565613981 is about 97803.9568780323. The cubic root of 9565613981 is about 2122.7765610909.

The spelling of 9565613981 in words is "nine billion, five hundred sixty-five million, six hundred thirteen thousand, nine hundred eighty-one".