1357245257 has 2 divisors, whose sum is σ = 1357245258. Its totient is φ = 1357245256.

The previous prime is 1357245223. The next prime is 1357245319. The reversal of 1357245257 is 7525427531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240518841 + 116726416 = 35221^2 + 10804^2 .

It is a cyclic number.

It is not a de Polignac number, because 1357245257 - 2¹⁸ = 1356983113 is a prime.

It is a super-2 number, since 2×1357245257² = 3684229375297992098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1357245217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678622628 + 678622629.

It is an arithmetic number, because the mean of its divisors is an integer number (678622629).

Almost surely, 2^1357245257 is an apocalyptic number.

It is an amenable number.

1357245257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1357245257 is an equidigital number, since it uses as much as digits as its factorization.

1357245257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294000, while the sum is 41.

The square root of 1357245257 is about 36840.8096680841. The cubic root of 1357245257 is about 1107.1830900803.

The spelling of 1357245257 in words is "one billion, three hundred fifty-seven million, two hundred forty-five thousand, two hundred fifty-seven".