255621193 has 4 divisors (see below), whose sum is σ = 269074960. Its totient is φ = 242167428.

The previous prime is 255621187. The next prime is 255621199. The reversal of 255621193 is 391126552.

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 an interprime number because it is at equal distance from previous prime (255621187) and next prime (255621199).

It is a cyclic number.

It is not a de Polignac number, because 255621193 - 2¹⁷ = 255490121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255621199) 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, 6726855 + ... + 6726892.

It is an arithmetic number, because the mean of its divisors is an integer number (67268740).

Almost surely, 2^255621193 is an apocalyptic number.

It is an amenable number.

255621193 is a deficient number, since it is larger than the sum of its proper divisors (13453767).

255621193 is a wasteful number, since it uses less digits than its factorization.

255621193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13453766.

The product of its digits is 16200, while the sum is 34.

The square root of 255621193 is about 15988.1578988950. The cubic root of 255621193 is about 634.6470793978.

The spelling of 255621193 in words is "two hundred fifty-five million, six hundred twenty-one thousand, one hundred ninety-three".