149990391 has 6 divisors (see below), whose sum is σ = 216652800. Its totient is φ = 99993588.

The previous prime is 149990359. The next prime is 149990413. The reversal of 149990391 is 193099941.

It is not a de Polignac number, because 149990391 - 2⁵ = 149990359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149994391) 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 in 5 ways as a sum of consecutive naturals, for example, 8332791 + ... + 8332808.

It is an arithmetic number, because the mean of its divisors is an integer number (36108800).

Almost surely, 2^149990391 is an apocalyptic number.

149990391 is a deficient number, since it is larger than the sum of its proper divisors (66662409).

149990391 is a wasteful number, since it uses less digits than its factorization.

149990391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16665605 (or 16665602 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 149990391 is about 12247.0564218509. The cubic root of 149990391 is about 531.3179386977.

The spelling of 149990391 in words is "one hundred forty-nine million, nine hundred ninety thousand, three hundred ninety-one".