255251615 has 4 divisors (see below), whose sum is σ = 306301944. Its totient is φ = 204201288.

The previous prime is 255251599. The next prime is 255251621. The reversal of 255251615 is 516152552.

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 255251615 - 2⁴ = 255251599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25525157 + ... + 25525166.

It is an arithmetic number, because the mean of its divisors is an integer number (76575486).

Almost surely, 2^255251615 is an apocalyptic number.

255251615 is a deficient number, since it is larger than the sum of its proper divisors (51050329).

255251615 is an equidigital number, since it uses as much as digits as its factorization.

255251615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51050328.

The product of its digits is 15000, while the sum is 32.

The square root of 255251615 is about 15976.5958514322. The cubic root of 255251615 is about 634.3410735656.

The spelling of 255251615 in words is "two hundred fifty-five million, two hundred fifty-one thousand, six hundred fifteen".