2151561232 has 20 divisors (see below), whose sum is σ = 4209125440. Its totient is φ = 1065335328.

The previous prime is 2151561227. The next prime is 2151561233. The reversal of 2151561232 is 2321651512.

It is a super-3 number, since 3×2151561232³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2151561232.

It is not an unprimeable number, because it can be changed into a prime (2151561233) 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, 651132 + ... + 654427.

It is an arithmetic number, because the mean of its divisors is an integer number (210456272).

Almost surely, 2^2151561232 is an apocalyptic number.

It is an amenable number.

2151561232 is a deficient number, since it is larger than the sum of its proper divisors (2057564208).

2151561232 is a wasteful number, since it uses less digits than its factorization.

2151561232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305670 (or 1305664 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 2151561232 is about 46384.9246199668. The cubic root of 2151561232 is about 1290.9752119372.

The spelling of 2151561232 in words is "two billion, one hundred fifty-one million, five hundred sixty-one thousand, two hundred thirty-two".