257421733 has 2 divisors, whose sum is σ = 257421734. Its totient is φ = 257421732.

The previous prime is 257421721. The next prime is 257421757. The reversal of 257421733 is 337124752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191600964 + 65820769 = 13842^2 + 8113^2 .

It is a cyclic number.

It is not a de Polignac number, because 257421733 - 2¹⁷ = 257290661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257421763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128710866 + 128710867.

It is an arithmetic number, because the mean of its divisors is an integer number (128710867).

Almost surely, 2^257421733 is an apocalyptic number.

It is an amenable number.

257421733 is a deficient number, since it is larger than the sum of its proper divisors (1).

257421733 is an equidigital number, since it uses as much as digits as its factorization.

257421733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 34.

The square root of 257421733 is about 16044.3676410135. The cubic root of 257421733 is about 636.1336996254.

The spelling of 257421733 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, seven hundred thirty-three".