215256451 has 8 divisors (see below), whose sum is σ = 218592000. Its totient is φ = 211929480.

The previous prime is 215256443. The next prime is 215256493. The reversal of 215256451 is 154652512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215256451 - 2³ = 215256443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215256421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63600 + ... + 66898.

It is an arithmetic number, because the mean of its divisors is an integer number (27324000).

Almost surely, 2^215256451 is an apocalyptic number.

215256451 is a deficient number, since it is larger than the sum of its proper divisors (3335549).

215256451 is an equidigital number, since it uses as much as digits as its factorization.

215256451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289.

The product of its digits is 12000, while the sum is 31.

The square root of 215256451 is about 14671.6205989659. The cubic root of 215256451 is about 599.3107372016.

The spelling of 215256451 in words is "two hundred fifteen million, two hundred fifty-six thousand, four hundred fifty-one".