257532907 has 2 divisors, whose sum is σ = 257532908. Its totient is φ = 257532906.

The previous prime is 257532901. The next prime is 257532917. The reversal of 257532907 is 709235752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257532907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257532907.

It is not a weakly prime, because it can be changed into another prime (257532901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128766453 + 128766454.

It is an arithmetic number, because the mean of its divisors is an integer number (128766454).

Almost surely, 2^257532907 is an apocalyptic number.

257532907 is a deficient number, since it is larger than the sum of its proper divisors (1).

257532907 is an equidigital number, since it uses as much as digits as its factorization.

257532907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 257532907 is about 16047.8318473244. The cubic root of 257532907 is about 636.2252631835.

The spelling of 257532907 in words is "two hundred fifty-seven million, five hundred thirty-two thousand, nine hundred seven".