149019191 has 4 divisors (see below), whose sum is σ = 151545000. Its totient is φ = 146493384.

The previous prime is 149019173. The next prime is 149019203. The reversal of 149019191 is 191910941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 149019191 - 2¹⁸ = 148757047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149019491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1262816 + ... + 1262933.

It is an arithmetic number, because the mean of its divisors is an integer number (37886250).

Almost surely, 2^149019191 is an apocalyptic number.

149019191 is a deficient number, since it is larger than the sum of its proper divisors (2525809).

149019191 is an equidigital number, since it uses as much as digits as its factorization.

149019191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525808.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 149019191 is about 12207.3416844127. The cubic root of 149019191 is about 530.1686789552.

The spelling of 149019191 in words is "one hundred forty-nine million, nineteen thousand, one hundred ninety-one".