2156157739 has 2 divisors, whose sum is σ = 2156157740. Its totient is φ = 2156157738.

The previous prime is 2156157737. The next prime is 2156157761. The reversal of 2156157739 is 9377516512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156157739 - 2¹ = 2156157737 is a prime.

Together with 2156157737, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2156157737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078078869 + 1078078870.

It is an arithmetic number, because the mean of its divisors is an integer number (1078078870).

Almost surely, 2^2156157739 is an apocalyptic number.

2156157739 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156157739 is an equidigital number, since it uses as much as digits as its factorization.

2156157739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 396900, while the sum is 46.

The square root of 2156157739 is about 46434.4456088366. The cubic root of 2156157739 is about 1291.8938868382.

It can be divided in two parts, 2156 and 157739, that added together give a triangular number (159895 = T₅₆₅).

The spelling of 2156157739 in words is "two billion, one hundred fifty-six million, one hundred fifty-seven thousand, seven hundred thirty-nine".