1231621252 has 12 divisors (see below), whose sum is σ = 2184862876. Its totient is φ = 607374720.

The previous prime is 1231621247. The next prime is 1231621277. The reversal of 1231621252 is 2521261321.

It can be written as a sum of positive squares in 2 ways, for example, as 453434436 + 778186816 = 21294^2 + 27896^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2108649 + ... + 2109232.

Almost surely, 2^1231621252 is an apocalyptic number.

It is an amenable number.

1231621252 is a deficient number, since it is larger than the sum of its proper divisors (953241624).

1231621252 is a wasteful number, since it uses less digits than its factorization.

1231621252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4217958 (or 4217956 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 1231621252 is about 35094.4618422907. The cubic root of 1231621252 is about 1071.9118153958.

Adding to 1231621252 its reverse (2521261321), we get a palindrome (3752882573).

The spelling of 1231621252 in words is "one billion, two hundred thirty-one million, six hundred twenty-one thousand, two hundred fifty-two".