255061621 has 4 divisors (see below), whose sum is σ = 260488512. Its totient is φ = 249634732.

The previous prime is 255061603. The next prime is 255061633. The reversal of 255061621 is 126160552.

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 a cyclic number.

It is not a de Polignac number, because 255061621 - 2¹¹ = 255059573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255061621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255061021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2713375 + ... + 2713468.

It is an arithmetic number, because the mean of its divisors is an integer number (65122128).

Almost surely, 2^255061621 is an apocalyptic number.

It is an amenable number.

255061621 is a deficient number, since it is larger than the sum of its proper divisors (5426891).

255061621 is an equidigital number, since it uses as much as digits as its factorization.

255061621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5426890.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 255061621 is about 15970.6487344754. The cubic root of 255061621 is about 634.1836460104.

The spelling of 255061621 in words is "two hundred fifty-five million, sixty-one thousand, six hundred twenty-one".