2158556531 has 2 divisors, whose sum is σ = 2158556532. Its totient is φ = 2158556530.

The previous prime is 2158556489. The next prime is 2158556537. The reversal of 2158556531 is 1356558512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2158556531 is a prime.

It is a super-2 number, since 2×2158556531² = 9318732595045507922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2158556537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079278265 + 1079278266.

It is an arithmetic number, because the mean of its divisors is an integer number (1079278266).

Almost surely, 2^2158556531 is an apocalyptic number.

2158556531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158556531 is an equidigital number, since it uses as much as digits as its factorization.

2158556531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180000, while the sum is 41.

The square root of 2158556531 is about 46460.2683052950. The cubic root of 2158556531 is about 1292.3727998812.

The spelling of 2158556531 in words is "two billion, one hundred fifty-eight million, five hundred fifty-six thousand, five hundred thirty-one".