55624421 has 2 divisors, whose sum is σ = 55624422. Its totient is φ = 55624420.

The previous prime is 55624417. The next prime is 55624427. The reversal of 55624421 is 12442655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 25867396 = 5455^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 55624421 - 2² = 55624417 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 (55624427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27812210 + 27812211.

It is an arithmetic number, because the mean of its divisors is an integer number (27812211).

Almost surely, 2^55624421 is an apocalyptic number.

It is an amenable number.

55624421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55624421 is an equidigital number, since it uses as much as digits as its factorization.

55624421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 29.

The square root of 55624421 is about 7458.1781287389. The cubic root of 55624421 is about 381.7290115944.

The spelling of 55624421 in words is "fifty-five million, six hundred twenty-four thousand, four hundred twenty-one".