1957937021 has 2 divisors, whose sum is σ = 1957937022. Its totient is φ = 1957937020.

The previous prime is 1957936999. The next prime is 1957937063. The reversal of 1957937021 is 1207397591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1665048025 + 292888996 = 40805^2 + 17114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1957937021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1957937071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978968510 + 978968511.

It is an arithmetic number, because the mean of its divisors is an integer number (978968511).

Almost surely, 2^1957937021 is an apocalyptic number.

It is an amenable number.

1957937021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957937021 is an equidigital number, since it uses as much as digits as its factorization.

1957937021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 1957937021 is about 44248.5821354764. The cubic root of 1957937021 is about 1251.0257225644.

The spelling of 1957937021 in words is "one billion, nine hundred fifty-seven million, nine hundred thirty-seven thousand, twenty-one".