1231153136 has 20 divisors (see below), whose sum is σ = 2386817472. Its totient is φ = 615200256.

The previous prime is 1231153097. The next prime is 1231153169. The reversal of 1231153136 is 6313511321.

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, 4481 + ... + 49823.

Almost surely, 2^1231153136 is an apocalyptic number.

1231153136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1231153136 is a deficient number, since it is larger than the sum of its proper divisors (1155664336).

1231153136 is a wasteful number, since it uses less digits than its factorization.

1231153136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47048 (or 47042 counting only the distinct ones).

The product of its digits is 1620, while the sum is 26.

The square root of 1231153136 is about 35087.7918370478. The cubic root of 1231153136 is about 1071.7759937011.

Adding to 1231153136 its reverse (6313511321), we get a palindrome (7544664457).

The spelling of 1231153136 in words is "one billion, two hundred thirty-one million, one hundred fifty-three thousand, one hundred thirty-six".