257601139 has 4 divisors (see below), whose sum is σ = 261967320. Its totient is φ = 253234960.

The previous prime is 257601121. The next prime is 257601161. The reversal of 257601139 is 931106752.

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

It is a cyclic number.

It is not a de Polignac number, because 257601139 - 2¹¹ = 257599091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257601199) 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, 2183002 + ... + 2183119.

It is an arithmetic number, because the mean of its divisors is an integer number (65491830).

Almost surely, 2^257601139 is an apocalyptic number.

257601139 is a deficient number, since it is larger than the sum of its proper divisors (4366181).

257601139 is an equidigital number, since it uses as much as digits as its factorization.

257601139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366180.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 257601139 is about 16049.9576011901. The cubic root of 257601139 is about 636.2814464099.

The spelling of 257601139 in words is "two hundred fifty-seven million, six hundred one thousand, one hundred thirty-nine".