55570813 has 2 divisors, whose sum is σ = 55570814. Its totient is φ = 55570812.

The previous prime is 55570769. The next prime is 55570831. The reversal of 55570813 is 31807555.

Together with next prime (55570831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35022724 + 20548089 = 5918^2 + 4533^2 .

It is a cyclic number.

It is not a de Polignac number, because 55570813 - 2¹³ = 55562621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55570883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27785406 + 27785407.

It is an arithmetic number, because the mean of its divisors is an integer number (27785407).

Almost surely, 2^55570813 is an apocalyptic number.

It is an amenable number.

55570813 is a deficient number, since it is larger than the sum of its proper divisors (1).

55570813 is an equidigital number, since it uses as much as digits as its factorization.

55570813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 55570813 is about 7454.5833552252. The cubic root of 55570813 is about 381.6063418151.

The spelling of 55570813 in words is "fifty-five million, five hundred seventy thousand, eight hundred thirteen".