255402561 has 4 divisors (see below), whose sum is σ = 340536752. Its totient is φ = 170268372.

The previous prime is 255402551. The next prime is 255402599. The reversal of 255402561 is 165204552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 255402561 - 2⁵ = 255402529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255402551) 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, 42567091 + ... + 42567096.

It is an arithmetic number, because the mean of its divisors is an integer number (85134188).

Almost surely, 2^255402561 is an apocalyptic number.

It is an amenable number.

255402561 is a deficient number, since it is larger than the sum of its proper divisors (85134191).

255402561 is an equidigital number, since it uses as much as digits as its factorization.

255402561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85134190.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 255402561 is about 15981.3191257793. The cubic root of 255402561 is about 634.4660905733.

The spelling of 255402561 in words is "two hundred fifty-five million, four hundred two thousand, five hundred sixty-one".