55541813 has 2 divisors, whose sum is σ = 55541814. Its totient is φ = 55541812.

The previous prime is 55541789. The next prime is 55541821. The reversal of 55541813 is 31814555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49815364 + 5726449 = 7058^2 + 2393^2 .

It is a cyclic number.

It is not a de Polignac number, because 55541813 - 2⁸ = 55541557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55541813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55541513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27770906 + 27770907.

It is an arithmetic number, because the mean of its divisors is an integer number (27770907).

Almost surely, 2^55541813 is an apocalyptic number.

It is an amenable number.

55541813 is a deficient number, since it is larger than the sum of its proper divisors (1).

55541813 is an equidigital number, since it uses as much as digits as its factorization.

55541813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 32.

The square root of 55541813 is about 7452.6379893297. The cubic root of 55541813 is about 381.5399489917.

The spelling of 55541813 in words is "fifty-five million, five hundred forty-one thousand, eight hundred thirteen".