55310621 has 2 divisors, whose sum is σ = 55310622. Its totient is φ = 55310620.

The previous prime is 55310617. The next prime is 55310663. The reversal of 55310621 is 12601355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32376100 + 22934521 = 5690^2 + 4789^2 .

It is a cyclic number.

It is not a de Polignac number, because 55310621 - 2² = 55310617 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 (55310921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27655310 + 27655311.

It is an arithmetic number, because the mean of its divisors is an integer number (27655311).

Almost surely, 2^55310621 is an apocalyptic number.

It is an amenable number.

55310621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55310621 is an equidigital number, since it uses as much as digits as its factorization.

55310621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 55310621 is about 7437.1110654608. Note that the first 3 decimals coincide. The cubic root of 55310621 is about 381.0098279143.

Adding to 55310621 its reverse (12601355), we get a palindrome (67911976).

The spelling of 55310621 in words is "fifty-five million, three hundred ten thousand, six hundred twenty-one".