256149 has 16 divisors (see below), whose sum is σ = 388800. Its totient is φ = 166608.

The previous prime is 256147. The next prime is 256163. The reversal of 256149 is 941652.

It is not a de Polignac number, because 256149 - 2¹ = 256147 is a prime.

It is a super-2 number, since 2×256149² = 131224620402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1342 + ... + 1520.

It is an arithmetic number, because the mean of its divisors is an integer number (24300).

2²⁵⁶¹⁴⁹ is an apocalyptic number.

It is an amenable number.

256149 is a deficient number, since it is larger than the sum of its proper divisors (132651).

256149 is a wasteful number, since it uses less digits than its factorization.

256149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 235 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 256149 is about 506.1116477616. Note that the first 3 decimals coincide. The cubic root of 256149 is about 63.5083585831.

The spelling of 256149 in words is "two hundred fifty-six thousand, one hundred forty-nine".