257121495 has 12 divisors (see below), whose sum is σ = 445677336. Its totient is φ = 137131440.

The previous prime is 257121461. The next prime is 257121499. The reversal of 257121495 is 594121752.

It is not a de Polignac number, because 257121495 - 2¹⁴ = 257105111 is a prime.

It is a super-2 number, since 2×257121495² = 132222926382070050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257121499) 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, 2856861 + ... + 2856950.

It is an arithmetic number, because the mean of its divisors is an integer number (37139778).

Almost surely, 2^257121495 is an apocalyptic number.

257121495 is a deficient number, since it is larger than the sum of its proper divisors (188555841).

257121495 is a wasteful number, since it uses less digits than its factorization.

257121495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5713822 (or 5713819 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 257121495 is about 16035.0084190810. The cubic root of 257121495 is about 635.8862900425.

The spelling of 257121495 in words is "two hundred fifty-seven million, one hundred twenty-one thousand, four hundred ninety-five".