149891 has 16 divisors (see below), whose sum is σ = 192000. Its totient is φ = 116424.

The previous prime is 149873. The next prime is 149893. The reversal of 149891 is 198941.

It is not a de Polignac number, because 149891 - 2⁶ = 149827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6506 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (12000).

2¹⁴⁹⁸⁹¹ is an apocalyptic number.

149891 is a deficient number, since it is larger than the sum of its proper divisors (42109).

149891 is an equidigital number, since it uses as much as digits as its factorization.

149891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 49 counting only the distinct ones).

The product of its digits is 2592, while the sum is 32.

The square root of 149891 is about 387.1575906527. The cubic root of 149891 is about 53.1200553645.

The spelling of 149891 in words is "one hundred forty-nine thousand, eight hundred ninety-one".