149091 has 4 divisors (see below), whose sum is σ = 198792. Its totient is φ = 99392.

The previous prime is 149087. The next prime is 149099. The reversal of 149091 is 190941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190941 = 3 ⋅63647.

It is a cyclic number.

It is not a de Polignac number, because 149091 - 2² = 149087 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (149099) 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, 24846 + ... + 24851.

It is an arithmetic number, because the mean of its divisors is an integer number (49698).

2¹⁴⁹⁰⁹¹ is an apocalyptic number.

149091 is a deficient number, since it is larger than the sum of its proper divisors (49701).

149091 is an equidigital number, since it uses as much as digits as its factorization.

149091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49700.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 149091 is about 386.1230373858. The cubic root of 149091 is about 53.0253824072.

The spelling of 149091 in words is "one hundred forty-nine thousand, ninety-one".