1555057213 has 2 divisors, whose sum is σ = 1555057214. Its totient is φ = 1555057212.

The previous prime is 1555057193. The next prime is 1555057219. The reversal of 1555057213 is 3127505551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1143657124 + 411400089 = 33818^2 + 20283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555057213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555057219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777528606 + 777528607.

It is an arithmetic number, because the mean of its divisors is an integer number (777528607).

Almost surely, 2^1555057213 is an apocalyptic number.

It is an amenable number.

1555057213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555057213 is an equidigital number, since it uses as much as digits as its factorization.

1555057213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26250, while the sum is 34.

The square root of 1555057213 is about 39434.2137362976. The cubic root of 1555057213 is about 1158.5518027942.

The spelling of 1555057213 in words is "one billion, five hundred fifty-five million, fifty-seven thousand, two hundred thirteen".