256257154 has 4 divisors (see below), whose sum is σ = 384385734. Its totient is φ = 128128576.

The previous prime is 256257151. The next prime is 256257163. The reversal of 256257154 is 451752652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 254881225 + 1375929 = 15965^2 + 1173^2 .

It is not an unprimeable number, because it can be changed into a prime (256257151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64064287 + ... + 64064290.

Almost surely, 2^256257154 is an apocalyptic number.

256257154 is a deficient number, since it is larger than the sum of its proper divisors (128128580).

256257154 is a wasteful number, since it uses less digits than its factorization.

256257154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128128579.

The product of its digits is 84000, while the sum is 37.

The square root of 256257154 is about 16008.0340454411. The cubic root of 256257154 is about 635.1729572061.

The spelling of 256257154 in words is "two hundred fifty-six million, two hundred fifty-seven thousand, one hundred fifty-four".