155007791 has 2 divisors, whose sum is σ = 155007792. Its totient is φ = 155007790.

The previous prime is 155007779. The next prime is 155007799. The reversal of 155007791 is 197700551.

It is a strong prime.

It is an emirp because it is prime and its reverse (197700551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155007791 is a prime.

It is a Sophie Germain 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 (155007799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77503895 + 77503896.

It is an arithmetic number, because the mean of its divisors is an integer number (77503896).

Almost surely, 2^155007791 is an apocalyptic number.

155007791 is a deficient number, since it is larger than the sum of its proper divisors (1).

155007791 is an equidigital number, since it uses as much as digits as its factorization.

155007791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11025, while the sum is 35.

The square root of 155007791 is about 12450.2124881465. The cubic root of 155007791 is about 537.1775355159.

The spelling of 155007791 in words is "one hundred fifty-five million, seven thousand, seven hundred ninety-one".