55612621 has 2 divisors, whose sum is σ = 55612622. Its totient is φ = 55612620.

The previous prime is 55612619. The next prime is 55612657. The reversal of 55612621 is 12621655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 1590121 = 7350^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 55612621 - 2¹ = 55612619 is a prime.

It is a super-2 number, since 2×55612621² = 6185527228979282, which contains 22 as substring.

Together with 55612619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 55612621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55612681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27806310 + 27806311.

It is an arithmetic number, because the mean of its divisors is an integer number (27806311).

Almost surely, 2^55612621 is an apocalyptic number.

It is an amenable number.

55612621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55612621 is an equidigital number, since it uses as much as digits as its factorization.

55612621 is an evil number, because the sum of its binary digits is even.

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

The square root of 55612621 is about 7457.3870088658. The cubic root of 55612621 is about 381.7020167313.

The spelling of 55612621 in words is "fifty-five million, six hundred twelve thousand, six hundred twenty-one".