1213656512 has 28 divisors (see below), whose sum is σ = 2409495816. Its totient is φ = 606539520.

The previous prime is 1213656511. The next prime is 1213656517. The reversal of 1213656512 is 2156563121.

It is a super-2 number, since 2×1213656512² = 2945924258240012288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213656511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210338 + ... + 216030.

It is an arithmetic number, because the mean of its divisors is an integer number (86053422).

Almost surely, 2^1213656512 is an apocalyptic number.

It is an amenable number.

1213656512 is a deficient number, since it is larger than the sum of its proper divisors (1195839304).

1213656512 is an equidigital number, since it uses as much as digits as its factorization.

1213656512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9036 (or 9026 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 1213656512 is about 34837.5732794349. The cubic root of 1213656512 is about 1066.6745423030.

The spelling of 1213656512 in words is "one billion, two hundred thirteen million, six hundred fifty-six thousand, five hundred twelve".