155857313 has 2 divisors, whose sum is σ = 155857314. Its totient is φ = 155857312.

The previous prime is 155857267. The next prime is 155857319. The reversal of 155857313 is 313758551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152201569 + 3655744 = 12337^2 + 1912^2 .

It is a cyclic number.

It is not a de Polignac number, because 155857313 - 2²⁰ = 154808737 is a prime.

It is not a weakly prime, because it can be changed into another prime (155857319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77928656 + 77928657.

It is an arithmetic number, because the mean of its divisors is an integer number (77928657).

Almost surely, 2^155857313 is an apocalyptic number.

It is an amenable number.

155857313 is a deficient number, since it is larger than the sum of its proper divisors (1).

155857313 is an equidigital number, since it uses as much as digits as its factorization.

155857313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 38.

The square root of 155857313 is about 12484.2826385820. The cubic root of 155857313 is about 538.1570841222.

The spelling of 155857313 in words is "one hundred fifty-five million, eight hundred fifty-seven thousand, three hundred thirteen".