155257 has 4 divisors (see below), whose sum is σ = 156816. Its totient is φ = 153700.

The previous prime is 155251. The next prime is 155269. The reversal of 155257 is 752551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752551 = 101 ⋅7451.

It is a cyclic number.

It is not a de Polignac number, because 155257 - 2¹⁵ = 122489 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (155251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619 + ... + 832.

It is an arithmetic number, because the mean of its divisors is an integer number (39204).

2¹⁵⁵²⁵⁷ is an apocalyptic number.

It is an amenable number.

155257 is a deficient number, since it is larger than the sum of its proper divisors (1559).

155257 is a wasteful number, since it uses less digits than its factorization.

155257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558.

The product of its digits is 1750, while the sum is 25.

The square root of 155257 is about 394.0266488450. The cubic root of 155257 is about 53.7465258256.

The spelling of 155257 in words is "one hundred fifty-five thousand, two hundred fifty-seven".