1257857477 has 2 divisors, whose sum is σ = 1257857478. Its totient is φ = 1257857476.

The previous prime is 1257857473. The next prime is 1257857483. The reversal of 1257857477 is 7747587521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817445281 + 440412196 = 28591^2 + 20986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257857477 - 2² = 1257857473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257857473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628928738 + 628928739.

It is an arithmetic number, because the mean of its divisors is an integer number (628928739).

Almost surely, 2^1257857477 is an apocalyptic number.

It is an amenable number.

1257857477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257857477 is an equidigital number, since it uses as much as digits as its factorization.

1257857477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3841600, while the sum is 53.

The square root of 1257857477 is about 35466.2864844912. The cubic root of 1257857477 is about 1079.4697548557.

The spelling of 1257857477 in words is "one billion, two hundred fifty-seven million, eight hundred fifty-seven thousand, four hundred seventy-seven".