149117891 has 4 divisors (see below), whose sum is σ = 160588512. Its totient is φ = 137647272.

The previous prime is 149117873. The next prime is 149117893. The reversal of 149117891 is 198711941.

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 149117891 - 2¹⁰ = 149116867 is a prime.

It is a super-2 number, since 2×149117891² = 44472290832575762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149117893) 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, 5735291 + ... + 5735316.

It is an arithmetic number, because the mean of its divisors is an integer number (40147128).

Almost surely, 2^149117891 is an apocalyptic number.

149117891 is a deficient number, since it is larger than the sum of its proper divisors (11470621).

149117891 is a wasteful number, since it uses less digits than its factorization.

149117891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11470620.

The product of its digits is 18144, while the sum is 41.

The square root of 149117891 is about 12211.3836644338. The cubic root of 149117891 is about 530.2857021381.

The spelling of 149117891 in words is "one hundred forty-nine million, one hundred seventeen thousand, eight hundred ninety-one".