257423121 has 12 divisors (see below), whose sum is σ = 372420048. Its totient is φ = 171344664.

The previous prime is 257423119. The next prime is 257423147. The reversal of 257423121 is 121324752.

It is not a de Polignac number, because 257423121 - 2¹ = 257423119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257423821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16455 + ... + 28028.

It is an arithmetic number, because the mean of its divisors is an integer number (31035004).

Almost surely, 2^257423121 is an apocalyptic number.

It is an amenable number.

257423121 is a deficient number, since it is larger than the sum of its proper divisors (114996927).

257423121 is a wasteful number, since it uses less digits than its factorization.

257423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45132 (or 45129 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 257423121 is about 16044.4108960099. The cubic root of 257423121 is about 636.1348429528.

Adding to 257423121 its reverse (121324752), we get a palindrome (378747873).

The spelling of 257423121 in words is "two hundred fifty-seven million, four hundred twenty-three thousand, one hundred twenty-one".