1215255136 has 12 divisors (see below), whose sum is σ = 2392533612. Its totient is φ = 607627552.

The previous prime is 1215255127. The next prime is 1215255137. The reversal of 1215255136 is 6315525121.

It is a junction number, because it is equal to n+sod(n) for n = 1215255098 and 1215255107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215255137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18988330 + ... + 18988393.

It is an arithmetic number, because the mean of its divisors is an integer number (199377801).

Almost surely, 2^1215255136 is an apocalyptic number.

1215255136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1215255136 is a deficient number, since it is larger than the sum of its proper divisors (1177278476).

1215255136 is an equidigital number, since it uses as much as digits as its factorization.

1215255136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37976733 (or 37976725 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 1215255136 is about 34860.5096922004. The cubic root of 1215255136 is about 1067.1426767805.

The spelling of 1215255136 in words is "one billion, two hundred fifteen million, two hundred fifty-five thousand, one hundred thirty-six".