1257425591 has 2 divisors, whose sum is σ = 1257425592. Its totient is φ = 1257425590.

The previous prime is 1257425581. The next prime is 1257425633. The reversal of 1257425591 is 1955247521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1257425591 is a prime.

It is a super-2 number, since 2×1257425591² = 3162238233803398562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257425551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628712795 + 628712796.

It is an arithmetic number, because the mean of its divisors is an integer number (628712796).

Almost surely, 2^1257425591 is an apocalyptic number.

1257425591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257425591 is an equidigital number, since it uses as much as digits as its factorization.

1257425591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126000, while the sum is 41.

The square root of 1257425591 is about 35460.1972780750. The cubic root of 1257425591 is about 1079.3461952180.

The spelling of 1257425591 in words is "one billion, two hundred fifty-seven million, four hundred twenty-five thousand, five hundred ninety-one".