1257323567 has 2 divisors, whose sum is σ = 1257323568. Its totient is φ = 1257323566.

The previous prime is 1257323549. The next prime is 1257323579. The reversal of 1257323567 is 7653237521.

It is a strong prime.

It is an emirp because it is prime and its reverse (7653237521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1257323567 - 2⁶ = 1257323503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257323597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628661783 + 628661784.

It is an arithmetic number, because the mean of its divisors is an integer number (628661784).

Almost surely, 2^1257323567 is an apocalyptic number.

1257323567 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257323567 is an equidigital number, since it uses as much as digits as its factorization.

1257323567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 41.

The square root of 1257323567 is about 35458.7586782166. The cubic root of 1257323567 is about 1079.3170027167.

The spelling of 1257323567 in words is "one billion, two hundred fifty-seven million, three hundred twenty-three thousand, five hundred sixty-seven".