2131122157 has 2 divisors, whose sum is σ = 2131122158. Its totient is φ = 2131122156.

The previous prime is 2131122143. The next prime is 2131122167. The reversal of 2131122157 is 7512211312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2077627561 + 53494596 = 45581^2 + 7314^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131122157 - 2⁷ = 2131122029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131122127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065561078 + 1065561079.

It is an arithmetic number, because the mean of its divisors is an integer number (1065561079).

Almost surely, 2^2131122157 is an apocalyptic number.

It is an amenable number.

2131122157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131122157 is an equidigital number, since it uses as much as digits as its factorization.

2131122157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 25.

The square root of 2131122157 is about 46164.0786434648. The cubic root of 2131122157 is about 1286.8742617052.

Adding to 2131122157 its reverse (7512211312), we get a palindrome (9643333469).

The spelling of 2131122157 in words is "two billion, one hundred thirty-one million, one hundred twenty-two thousand, one hundred fifty-seven".