55957621 has 2 divisors, whose sum is σ = 55957622. Its totient is φ = 55957620.

The previous prime is 55957607. The next prime is 55957633. The reversal of 55957621 is 12675955.

55957621 = 5289² + 5290².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 27973521 = 5290^2 + 5289^2 .

It is a cyclic number.

It is not a de Polignac number, because 55957621 - 2¹³ = 55949429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55937621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27978810 + 27978811.

It is an arithmetic number, because the mean of its divisors is an integer number (27978811).

Almost surely, 2^55957621 is an apocalyptic number.

55957621 is the 5290-th centered square number.

It is an amenable number.

55957621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55957621 is an equidigital number, since it uses as much as digits as its factorization.

55957621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 40.

The square root of 55957621 is about 7480.4826715928. The cubic root of 55957621 is about 382.4897025436.

The spelling of 55957621 in words is "fifty-five million, nine hundred fifty-seven thousand, six hundred twenty-one".