55435621 has 2 divisors, whose sum is σ = 55435622. Its totient is φ = 55435620.

The previous prime is 55435591. The next prime is 55435631. The reversal of 55435621 is 12653455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44742721 + 10692900 = 6689^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 55435621 - 2⁹ = 55435109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55435631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27717810 + 27717811.

It is an arithmetic number, because the mean of its divisors is an integer number (27717811).

Almost surely, 2^55435621 is an apocalyptic number.

It is an amenable number.

55435621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55435621 is an equidigital number, since it uses as much as digits as its factorization.

55435621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 31.

The square root of 55435621 is about 7445.5101235577. The cubic root of 55435621 is about 381.2966347684.

The spelling of 55435621 in words is "fifty-five million, four hundred thirty-five thousand, six hundred twenty-one".