155090191 has 2 divisors, whose sum is σ = 155090192. Its totient is φ = 155090190.

The previous prime is 155090189. The next prime is 155090203. The reversal of 155090191 is 191090551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155090191 - 2¹ = 155090189 is a prime.

Together with 155090189, it forms a pair of twin primes.

It is equal to p_8714344 and since 155090191 and 8714344 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155090891) 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, 77545095 + 77545096.

It is an arithmetic number, because the mean of its divisors is an integer number (77545096).

Almost surely, 2^155090191 is an apocalyptic number.

155090191 is a deficient number, since it is larger than the sum of its proper divisors (1).

155090191 is an equidigital number, since it uses as much as digits as its factorization.

155090191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 155090191 is about 12453.5212289537. The cubic root of 155090191 is about 537.2727040397.

The spelling of 155090191 in words is "one hundred fifty-five million, ninety thousand, one hundred ninety-one".