55826621 has 2 divisors, whose sum is σ = 55826622. Its totient is φ = 55826620.

The previous prime is 55826593. The next prime is 55826627. The reversal of 55826621 is 12662855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39866596 + 15960025 = 6314^2 + 3995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55826621 is a prime.

It is a super-2 number, since 2×55826621² = 6233223224555282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55826627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27913310 + 27913311.

It is an arithmetic number, because the mean of its divisors is an integer number (27913311).

Almost surely, 2^55826621 is an apocalyptic number.

It is an amenable number.

55826621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55826621 is an equidigital number, since it uses as much as digits as its factorization.

55826621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 55826621 is about 7471.7214214664. The cubic root of 55826621 is about 382.1909925465.

The spelling of 55826621 in words is "fifty-five million, eight hundred twenty-six thousand, six hundred twenty-one".