1231644532 has 6 divisors (see below), whose sum is σ = 2155377938. Its totient is φ = 615822264.

The previous prime is 1231644511. The next prime is 1231644563. The reversal of 1231644532 is 2354461321.

It can be written as a sum of positive squares in only one way, i.e., 1231588836 + 55696 = 35094^2 + 236^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1231644494 and 1231644503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153955563 + ... + 153955570.

Almost surely, 2^1231644532 is an apocalyptic number.

It is an amenable number.

1231644532 is a deficient number, since it is larger than the sum of its proper divisors (923733406).

1231644532 is a wasteful number, since it uses less digits than its factorization.

1231644532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307911137 (or 307911135 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 1231644532 is about 35094.7935169877. The cubic root of 1231644532 is about 1071.9185690818.

The spelling of 1231644532 in words is "one billion, two hundred thirty-one million, six hundred forty-four thousand, five hundred thirty-two".