2151553231 has 8 divisors (see below), whose sum is σ = 2158221744. Its totient is φ = 2144896320.

The previous prime is 2151553223. The next prime is 2151553249. The reversal of 2151553231 is 1323551512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2151553231 - 2³ = 2151553223 is a prime.

It is a super-2 number, since 2×2151553231² = 9258362611653078722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2151553231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151553211) 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, 487125 + ... + 491521.

It is an arithmetic number, because the mean of its divisors is an integer number (269777718).

Almost surely, 2^2151553231 is an apocalyptic number.

2151553231 is a deficient number, since it is larger than the sum of its proper divisors (6668513).

2151553231 is an equidigital number, since it uses as much as digits as its factorization.

2151553231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5801.

The product of its digits is 4500, while the sum is 28.

The square root of 2151553231 is about 46384.8383741929. The cubic root of 2151553231 is about 1290.9736116876.

The spelling of 2151553231 in words is "two billion, one hundred fifty-one million, five hundred fifty-three thousand, two hundred thirty-one".