257015293 has 2 divisors, whose sum is σ = 257015294. Its totient is φ = 257015292.

The previous prime is 257015273. The next prime is 257015359. The reversal of 257015293 is 392510752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181360089 + 75655204 = 13467^2 + 8698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257015293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257015273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128507646 + 128507647.

It is an arithmetic number, because the mean of its divisors is an integer number (128507647).

Almost surely, 2^257015293 is an apocalyptic number.

It is an amenable number.

257015293 is a deficient number, since it is larger than the sum of its proper divisors (1).

257015293 is an equidigital number, since it uses as much as digits as its factorization.

257015293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 257015293 is about 16031.6965103510. The cubic root of 257015293 is about 635.7987287182.

The spelling of 257015293 in words is "two hundred fifty-seven million, fifteen thousand, two hundred ninety-three".