256212415 has 4 divisors (see below), whose sum is σ = 307454904. Its totient is φ = 204969928.

The previous prime is 256212413. The next prime is 256212431. The reversal of 256212415 is 514212652.

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

It is a cyclic number.

It is not a de Polignac number, because 256212415 - 2¹ = 256212413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256212413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25621237 + ... + 25621246.

It is an arithmetic number, because the mean of its divisors is an integer number (76863726).

Almost surely, 2^256212415 is an apocalyptic number.

256212415 is a deficient number, since it is larger than the sum of its proper divisors (51242489).

256212415 is an equidigital number, since it uses as much as digits as its factorization.

256212415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51242488.

The product of its digits is 4800, while the sum is 28.

The square root of 256212415 is about 16006.6365923638. The cubic root of 256212415 is about 635.1359908796.

The spelling of 256212415 in words is "two hundred fifty-six million, two hundred twelve thousand, four hundred fifteen".