155455813 has 2 divisors, whose sum is σ = 155455814. Its totient is φ = 155455812.

The previous prime is 155455801. The next prime is 155455819. The reversal of 155455813 is 318554551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137874564 + 17581249 = 11742^2 + 4193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155455813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155455819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77727906 + 77727907.

It is an arithmetic number, because the mean of its divisors is an integer number (77727907).

Almost surely, 2^155455813 is an apocalyptic number.

It is an amenable number.

155455813 is a deficient number, since it is larger than the sum of its proper divisors (1).

155455813 is an equidigital number, since it uses as much as digits as its factorization.

155455813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60000, while the sum is 37.

The square root of 155455813 is about 12468.1920501731. The cubic root of 155455813 is about 537.6945758861.

The spelling of 155455813 in words is "one hundred fifty-five million, four hundred fifty-five thousand, eight hundred thirteen".