2157183535231 has 4 divisors (see below), whose sum is σ = 2157193400152. Its totient is φ = 2157173670312.

The previous prime is 2157183535229. The next prime is 2157183535271. The reversal of 2157183535231 is 1325353817512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2157183535231 - 2¹ = 2157183535229 is a prime.

It is a super-2 number, since 2×2157183535231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157183535271) 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, 4596840 + ... + 5044333.

It is an arithmetic number, because the mean of its divisors is an integer number (539298350038).

Almost surely, 2^{2157183535231} is an apocalyptic number.

2157183535231 is a deficient number, since it is larger than the sum of its proper divisors (9864921).

2157183535231 is an equidigital number, since it uses as much as digits as its factorization.

2157183535231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9864920.

The product of its digits is 756000, while the sum is 46.

The spelling of 2157183535231 in words is "two trillion, one hundred fifty-seven billion, one hundred eighty-three million, five hundred thirty-five thousand, two hundred thirty-one".