155321791 has 2 divisors, whose sum is σ = 155321792. Its totient is φ = 155321790.

The previous prime is 155321779. The next prime is 155321813. The reversal of 155321791 is 197123551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155321791 - 2⁵ = 155321759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155321731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77660895 + 77660896.

It is an arithmetic number, because the mean of its divisors is an integer number (77660896).

Almost surely, 2^155321791 is an apocalyptic number.

155321791 is a deficient number, since it is larger than the sum of its proper divisors (1).

155321791 is an equidigital number, since it uses as much as digits as its factorization.

155321791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 34.

The square root of 155321791 is about 12462.8163350023. The cubic root of 155321791 is about 537.5400118763.

The spelling of 155321791 in words is "one hundred fifty-five million, three hundred twenty-one thousand, seven hundred ninety-one".