9561931644 has 12 divisors (see below), whose sum is σ = 22311173864. Its totient is φ = 3187310544.

The previous prime is 9561931637. The next prime is 9561931661. The reversal of 9561931644 is 4461391659.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 9561931593 and 9561931602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398413807 + ... + 398413830.

Almost surely, 2^9561931644 is an apocalyptic number.

It is an amenable number.

9561931644 is an abundant number, since it is smaller than the sum of its proper divisors (12749242220).

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

9561931644 is a wasteful number, since it uses less digits than its factorization.

9561931644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796827644 (or 796827642 counting only the distinct ones).

The product of its digits is 699840, while the sum is 48.

The square root of 9561931644 is about 97785.1299738360. The cubic root of 9561931644 is about 2122.5041345312.

The spelling of 9561931644 in words is "nine billion, five hundred sixty-one million, nine hundred thirty-one thousand, six hundred forty-four".