1231516908 has 18 divisors (see below), whose sum is σ = 3113001164. Its totient is φ = 410505624.

The previous prime is 1231516849. The next prime is 1231516919. The reversal of 1231516908 is 8096151321.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 34208803 = 1231516908 / (1 + 2 + 3 + 1 + 5 + 1 + 6 + 9 + 0 + 8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17104366 + ... + 17104437.

Almost surely, 2^1231516908 is an apocalyptic number.

1231516908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1231516908 is an abundant number, since it is smaller than the sum of its proper divisors (1881484256).

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

1231516908 is a wasteful number, since it uses less digits than its factorization.

1231516908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34208813 (or 34208808 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1231516908 is about 35092.9751944745. The cubic root of 1231516908 is about 1071.8815434473.

The spelling of 1231516908 in words is "one billion, two hundred thirty-one million, five hundred sixteen thousand, nine hundred eight".