149271191 has 2 divisors, whose sum is σ = 149271192. Its totient is φ = 149271190.

The previous prime is 149271151. The next prime is 149271193. The reversal of 149271191 is 191172941.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149271191 is a prime.

Together with 149271193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149271193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74635595 + 74635596.

It is an arithmetic number, because the mean of its divisors is an integer number (74635596).

Almost surely, 2^149271191 is an apocalyptic number.

149271191 is a deficient number, since it is larger than the sum of its proper divisors (1).

149271191 is an equidigital number, since it uses as much as digits as its factorization.

149271191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 35.

The square root of 149271191 is about 12217.6589819818. The cubic root of 149271191 is about 530.4673592058.

The spelling of 149271191 in words is "one hundred forty-nine million, two hundred seventy-one thousand, one hundred ninety-one".