155713391 has 2 divisors, whose sum is σ = 155713392. Its totient is φ = 155713390.

The previous prime is 155713373. The next prime is 155713399. The reversal of 155713391 is 193317551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155713391 - 2²² = 151519087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155713399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77856695 + 77856696.

It is an arithmetic number, because the mean of its divisors is an integer number (77856696).

Almost surely, 2^155713391 is an apocalyptic number.

155713391 is a deficient number, since it is larger than the sum of its proper divisors (1).

155713391 is an equidigital number, since it uses as much as digits as its factorization.

155713391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14175, while the sum is 35.

The square root of 155713391 is about 12478.5171795370. The cubic root of 155713391 is about 537.9913844937.

The spelling of 155713391 in words is "one hundred fifty-five million, seven hundred thirteen thousand, three hundred ninety-one".