257242633 has 4 divisors (see below), whose sum is σ = 257486148. Its totient is φ = 256999120.

The previous prime is 257242591. The next prime is 257242637. The reversal of 257242633 is 336242752.

257242633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132987024 + 124255609 = 11532^2 + 11147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257242633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257242637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120166 + ... + 122287.

It is an arithmetic number, because the mean of its divisors is an integer number (64371537).

Almost surely, 2^257242633 is an apocalyptic number.

It is an amenable number.

257242633 is a deficient number, since it is larger than the sum of its proper divisors (243515).

257242633 is a wasteful number, since it uses less digits than its factorization.

257242633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243514.

The product of its digits is 60480, while the sum is 34.

The square root of 257242633 is about 16038.7852719587. The cubic root of 257242633 is about 635.9861363551.

The spelling of 257242633 in words is "two hundred fifty-seven million, two hundred forty-two thousand, six hundred thirty-three".