1215115512 has 64 divisors (see below), whose sum is σ = 3443664000. Its totient is φ = 354201984.

The previous prime is 1215115501. The next prime is 1215115519. The reversal of 1215115512 is 2155115121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215115519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96562 + ... + 108417.

It is an arithmetic number, because the mean of its divisors is an integer number (53807250).

Almost surely, 2^1215115512 is an apocalyptic number.

1215115512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215115512 is an abundant number, since it is smaller than the sum of its proper divisors (2228548488).

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

1215115512 is a wasteful number, since it uses less digits than its factorization.

1215115512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205020 (or 205016 counting only the distinct ones).

The product of its digits is 500, while the sum is 24.

The square root of 1215115512 is about 34858.5070248282. The cubic root of 1215115512 is about 1067.1018062309.

The spelling of 1215115512 in words is "one billion, two hundred fifteen million, one hundred fifteen thousand, five hundred twelve".