149181 has 4 divisors (see below), whose sum is σ = 198912. Its totient is φ = 99452.

The previous prime is 149173. The next prime is 149183. The reversal of 149181 is 181941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181941 = 3 ⋅60647.

It is a cyclic number.

It is not a de Polignac number, because 149181 - 2³ = 149173 is a prime.

It is a super-2 number, since 2×149181² = 44509941522, which contains 22 as substring.

It is a D-number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 149181.

It is not an unprimeable number, because it can be changed into a prime (149183) 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, 24861 + ... + 24866.

It is an arithmetic number, because the mean of its divisors is an integer number (49728).

2¹⁴⁹¹⁸¹ is an apocalyptic number.

It is an amenable number.

149181 is a deficient number, since it is larger than the sum of its proper divisors (49731).

149181 is an equidigital number, since it uses as much as digits as its factorization.

149181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49730.

The product of its digits is 288, while the sum is 24.

The square root of 149181 is about 386.2395629658. The cubic root of 149181 is about 53.0360499960.

The spelling of 149181 in words is "one hundred forty-nine thousand, one hundred eighty-one".