256031506 has 4 divisors (see below), whose sum is σ = 384047262. Its totient is φ = 128015752.

The previous prime is 256031497. The next prime is 256031507. The reversal of 256031506 is 605130652.

256031506 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 only one way, i.e., 244640881 + 11390625 = 15641^2 + 3375^2 .

It is not an unprimeable number, because it can be changed into a prime (256031507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64007875 + ... + 64007878.

Almost surely, 2^256031506 is an apocalyptic number.

256031506 is a deficient number, since it is larger than the sum of its proper divisors (128015756).

256031506 is a wasteful number, since it uses less digits than its factorization.

256031506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128015755.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 256031506 is about 16000.9845322093. The cubic root of 256031506 is about 634.9864679779.

The spelling of 256031506 in words is "two hundred fifty-six million, thirty-one thousand, five hundred six".