2156990612 has 24 divisors (see below), whose sum is σ = 4323614400. Its totient is φ = 922360320.

The previous prime is 2156990611. The next prime is 2156990659. The reversal of 2156990612 is 2160996512.

It is a super-2 number, since 2×2156990612² = 9305217000512269088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2156990612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156990611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73214 + ... + 98357.

It is an arithmetic number, because the mean of its divisors is an integer number (180150600).

Almost surely, 2^2156990612 is an apocalyptic number.

It is an amenable number.

2156990612 is an abundant number, since it is smaller than the sum of its proper divisors (2166623788).

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

2156990612 is a wasteful number, since it uses less digits than its factorization.

2156990612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172031 (or 172029 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 2156990612 is about 46443.4130098123. The cubic root of 2156990612 is about 1292.0602081614.

The spelling of 2156990612 in words is "two billion, one hundred fifty-six million, nine hundred ninety thousand, six hundred twelve".