2156042131 has 2 divisors, whose sum is σ = 2156042132. Its totient is φ = 2156042130.

The previous prime is 2156042129. The next prime is 2156042159. The reversal of 2156042131 is 1312406512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156042131 - 2¹ = 2156042129 is a prime.

It is a super-2 number, since 2×2156042131² = 9297035341294042322, which contains 22 as substring.

Together with 2156042129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2156042096 and 2156042105.

It is not a weakly prime, because it can be changed into another prime (2156042101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078021065 + 1078021066.

It is an arithmetic number, because the mean of its divisors is an integer number (1078021066).

Almost surely, 2^2156042131 is an apocalyptic number.

2156042131 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156042131 is an equidigital number, since it uses as much as digits as its factorization.

2156042131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2156042131 is about 46433.2007404185. The cubic root of 2156042131 is about 1291.8707970096.

Adding to 2156042131 its reverse (1312406512), we get a palindrome (3468448643).

The spelling of 2156042131 in words is "two billion, one hundred fifty-six million, forty-two thousand, one hundred thirty-one".