561161520 has 100 divisors (see below), whose sum is σ = 1949019600. Its totient is φ = 149641344.

The previous prime is 561161519. The next prime is 561161537. The reversal of 561161520 is 25161165.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36820 + ... + 49779.

It is an arithmetic number, because the mean of its divisors is an integer number (19490196).

Almost surely, 2^561161520 is an apocalyptic number.

It is an amenable number.

561161520 is an abundant number, since it is smaller than the sum of its proper divisors (1387858080).

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

561161520 is a wasteful number, since it uses less digits than its factorization.

561161520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86624 (or 86609 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 561161520 is about 23688.8480091371. The cubic root of 561161520 is about 824.8265420451.

The spelling of 561161520 in words is "five hundred sixty-one million, one hundred sixty-one thousand, five hundred twenty".