256215003 has 16 divisors (see below), whose sum is σ = 373113216. Its totient is φ = 155099840.

The previous prime is 256214999. The next prime is 256215013. The reversal of 256215003 is 300512652.

It is a cyclic number.

It is not a de Polignac number, because 256215003 - 2² = 256214999 is a prime.

It is a super-2 number, since 2×256215003² = 131292255524580018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256215013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27376 + ... + 35522.

It is an arithmetic number, because the mean of its divisors is an integer number (23319576).

Almost surely, 2^256215003 is an apocalyptic number.

256215003 is a deficient number, since it is larger than the sum of its proper divisors (116898213).

256215003 is a wasteful number, since it uses less digits than its factorization.

256215003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9114.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 256215003 is about 16006.7174336277. The cubic root of 256215003 is about 635.1381293740.

Adding to 256215003 its reverse (300512652), we get a palindrome (556727655).

The spelling of 256215003 in words is "two hundred fifty-six million, two hundred fifteen thousand, three".