2156177137 has 2 divisors, whose sum is σ = 2156177138. Its totient is φ = 2156177136.

The previous prime is 2156177119. The next prime is 2156177147. The reversal of 2156177137 is 7317716512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1360429456 + 795747681 = 36884^2 + 28209^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156177137 - 2²³ = 2147788529 is a prime.

It is a super-2 number, since 2×2156177137² = 9298199692243033538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2156177137.

It is not a weakly prime, because it can be changed into another prime (2156177117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078088568 + 1078088569.

It is an arithmetic number, because the mean of its divisors is an integer number (1078088569).

Almost surely, 2^2156177137 is an apocalyptic number.

It is an amenable number.

2156177137 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156177137 is an equidigital number, since it uses as much as digits as its factorization.

2156177137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61740, while the sum is 40.

The square root of 2156177137 is about 46434.6544834782. The cubic root of 2156177137 is about 1291.8977610264.

The spelling of 2156177137 in words is "two billion, one hundred fifty-six million, one hundred seventy-seven thousand, one hundred thirty-seven".