1231550564 has 24 divisors (see below), whose sum is σ = 2185243200. Its totient is φ = 607255200.

The previous prime is 1231550543. The next prime is 1231550581. The reversal of 1231550564 is 4650551321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231550564.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76622 + ... + 91290.

It is an arithmetic number, because the mean of its divisors is an integer number (91051800).

Almost surely, 2^1231550564 is an apocalyptic number.

It is an amenable number.

1231550564 is a deficient number, since it is larger than the sum of its proper divisors (953692636).

1231550564 is a wasteful number, since it uses less digits than its factorization.

1231550564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14963 (or 14961 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1231550564 is about 35093.4547173686. The cubic root of 1231550564 is about 1071.8913078055.

The spelling of 1231550564 in words is "one billion, two hundred thirty-one million, five hundred fifty thousand, five hundred sixty-four".