257156101 has 4 divisors (see below), whose sum is σ = 257545804. Its totient is φ = 256766400.

The previous prime is 257156071. The next prime is 257156111. The reversal of 257156101 is 101651752.

257156101 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 217592001 + 39564100 = 14751^2 + 6290^2 .

It is a cyclic number.

It is not a de Polignac number, because 257156101 - 2⁵ = 257156069 is a prime.

It is a super-2 number, since 2×257156101² = 132258520563044402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257156101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257156111) 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, 193860 + ... + 195181.

It is an arithmetic number, because the mean of its divisors is an integer number (64386451).

Almost surely, 2^257156101 is an apocalyptic number.

It is an amenable number.

257156101 is a deficient number, since it is larger than the sum of its proper divisors (389703).

257156101 is an equidigital number, since it uses as much as digits as its factorization.

257156101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389702.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 257156101 is about 16036.0874592277. The cubic root of 257156101 is about 635.9148167562.

The spelling of 257156101 in words is "two hundred fifty-seven million, one hundred fifty-six thousand, one hundred one".