2157176129 has 2 divisors, whose sum is σ = 2157176130. Its totient is φ = 2157176128.

The previous prime is 2157176101. The next prime is 2157176143. The reversal of 2157176129 is 9216717512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1893990400 + 263185729 = 43520^2 + 16223^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157176129 - 2²⁰ = 2156127553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2157176149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078588064 + 1078588065.

It is an arithmetic number, because the mean of its divisors is an integer number (1078588065).

Almost surely, 2^2157176129 is an apocalyptic number.

It is an amenable number.

2157176129 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157176129 is an equidigital number, since it uses as much as digits as its factorization.

2157176129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 41.

The square root of 2157176129 is about 46445.4102038081. The cubic root of 2157176129 is about 1292.0972493151.

The spelling of 2157176129 in words is "two billion, one hundred fifty-seven million, one hundred seventy-six thousand, one hundred twenty-nine".