5156161921 has 2 divisors, whose sum is σ = 5156161922. Its totient is φ = 5156161920.

The previous prime is 5156161909. The next prime is 5156161943. The reversal of 5156161921 is 1291616515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4745694321 + 410467600 = 68889^2 + 20260^2 .

It is a cyclic number.

It is not a de Polignac number, because 5156161921 - 2⁷ = 5156161793 is a prime.

It is not a weakly prime, because it can be changed into another prime (5156161951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2578080960 + 2578080961.

It is an arithmetic number, because the mean of its divisors is an integer number (2578080961).

Almost surely, 2^5156161921 is an apocalyptic number.

It is an amenable number.

5156161921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5156161921 is an equidigital number, since it uses as much as digits as its factorization.

5156161921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 37.

The square root of 5156161921 is about 71806.4197756719. The cubic root of 5156161921 is about 1727.5959704663.

The spelling of 5156161921 in words is "five billion, one hundred fifty-six million, one hundred sixty-one thousand, nine hundred twenty-one".