55157813 has 2 divisors, whose sum is σ = 55157814. Its totient is φ = 55157812.

The previous prime is 55157807. The next prime is 55157821. The reversal of 55157813 is 31875155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55011889 + 145924 = 7417^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 55157813 - 2²⁴ = 38380597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55157803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27578906 + 27578907.

It is an arithmetic number, because the mean of its divisors is an integer number (27578907).

Almost surely, 2^55157813 is an apocalyptic number.

It is an amenable number.

55157813 is a deficient number, since it is larger than the sum of its proper divisors (1).

55157813 is an equidigital number, since it uses as much as digits as its factorization.

55157813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 35.

The square root of 55157813 is about 7426.8306160838. The cubic root of 55157813 is about 380.6586292494.

The spelling of 55157813 in words is "fifty-five million, one hundred fifty-seven thousand, eight hundred thirteen".