2131738957 has 2 divisors, whose sum is σ = 2131738958. Its totient is φ = 2131738956.

The previous prime is 2131738949. The next prime is 2131738981. The reversal of 2131738957 is 7598371312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1656978436 + 474760521 = 40706^2 + 21789^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131738957 - 2³ = 2131738949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131738907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065869478 + 1065869479.

It is an arithmetic number, because the mean of its divisors is an integer number (1065869479).

Almost surely, 2^2131738957 is an apocalyptic number.

It is an amenable number.

2131738957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131738957 is an equidigital number, since it uses as much as digits as its factorization.

2131738957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 2131738957 is about 46170.7586790601. The cubic root of 2131738957 is about 1286.9984009179.

The spelling of 2131738957 in words is "two billion, one hundred thirty-one million, seven hundred thirty-eight thousand, nine hundred fifty-seven".