1957297687 has 2 divisors, whose sum is σ = 1957297688. Its totient is φ = 1957297686.

The previous prime is 1957297633. The next prime is 1957297697. The reversal of 1957297687 is 7867927591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1957297687 - 2¹⁵ = 1957264919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1957297697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978648843 + 978648844.

It is an arithmetic number, because the mean of its divisors is an integer number (978648844).

Almost surely, 2^1957297687 is an apocalyptic number.

1957297687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957297687 is an equidigital number, since it uses as much as digits as its factorization.

1957297687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13335840, while the sum is 61.

The square root of 1957297687 is about 44241.3572011529. The cubic root of 1957297687 is about 1250.8895400513.

The spelling of 1957297687 in words is "one billion, nine hundred fifty-seven million, two hundred ninety-seven thousand, six hundred eighty-seven".