257013739 has 2 divisors, whose sum is σ = 257013740. Its totient is φ = 257013738.

The previous prime is 257013697. The next prime is 257013751. The reversal of 257013739 is 937310752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257013739 - 2¹⁹ = 256489451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257013698 and 257013707.

It is not a weakly prime, because it can be changed into another prime (257013439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128506869 + 128506870.

It is an arithmetic number, because the mean of its divisors is an integer number (128506870).

Almost surely, 2^257013739 is an apocalyptic number.

257013739 is a deficient number, since it is larger than the sum of its proper divisors (1).

257013739 is an equidigital number, since it uses as much as digits as its factorization.

257013739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 37.

The square root of 257013739 is about 16031.6480437914. The cubic root of 257013739 is about 635.7974472987.

It can be divided in two parts, 257013 and 739, that added together give a palindrome (257752).

The spelling of 257013739 in words is "two hundred fifty-seven million, thirteen thousand, seven hundred thirty-nine".