255942621 has 12 divisors (see below), whose sum is σ = 403303680. Its totient is φ = 155116680.

The previous prime is 255942611. The next prime is 255942629. The reversal of 255942621 is 126249552.

255942621 is a `hidden beast` number, since 2 + 5 + 594 + 2 + 62 + 1 = 666.

It is not a de Polignac number, because 255942621 - 2¹⁰ = 255941597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255942629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1292541 + ... + 1292738.

It is an arithmetic number, because the mean of its divisors is an integer number (33608640).

Almost surely, 2^255942621 is an apocalyptic number.

It is an amenable number.

255942621 is a deficient number, since it is larger than the sum of its proper divisors (147361059).

255942621 is a wasteful number, since it uses less digits than its factorization.

255942621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585296 (or 2585293 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 255942621 is about 15998.2068057642. The cubic root of 255942621 is about 634.9129779275.

The spelling of 255942621 in words is "two hundred fifty-five million, nine hundred forty-two thousand, six hundred twenty-one".