61255621 has 16 divisors (see below), whose sum is σ = 71503360. Its totient is φ = 51392880.

The previous prime is 61255613. The next prime is 61255643. The reversal of 61255621 is 12655216.

It is not a de Polignac number, because 61255621 - 2³ = 61255613 is a prime.

It is a super-2 number, since 2×61255621² = 7504502208191282, which contains 22 as substring.

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 61255621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61255421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98650 + ... + 99268.

It is an arithmetic number, because the mean of its divisors is an integer number (4468960).

Almost surely, 2^61255621 is an apocalyptic number.

It is an amenable number.

61255621 is a deficient number, since it is larger than the sum of its proper divisors (10247739).

61255621 is a wasteful number, since it uses less digits than its factorization.

61255621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904.

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

The square root of 61255621 is about 7826.5970255278. The cubic root of 61255621 is about 394.1988161470.

The spelling of 61255621 in words is "sixty-one million, two hundred fifty-five thousand, six hundred twenty-one".