2156564231 has 2 divisors, whose sum is σ = 2156564232. Its totient is φ = 2156564230.

The previous prime is 2156564119. The next prime is 2156564261. The reversal of 2156564231 is 1324656512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156564231 - 2¹⁰ = 2156563207 is a prime.

It is a super-2 number, since 2×2156564231² = 9301538564857242722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2156564191 and 2156564200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156564261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078282115 + 1078282116.

It is an arithmetic number, because the mean of its divisors is an integer number (1078282116).

Almost surely, 2^2156564231 is an apocalyptic number.

2156564231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156564231 is an equidigital number, since it uses as much as digits as its factorization.

2156564231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 2156564231 is about 46438.8224549245. The cubic root of 2156564231 is about 1291.9750669737.

The spelling of 2156564231 in words is "two billion, one hundred fifty-six million, five hundred sixty-four thousand, two hundred thirty-one".