149811 has 4 divisors (see below), whose sum is σ = 199752. Its totient is φ = 99872.

The previous prime is 149803. The next prime is 149827. The reversal of 149811 is 118941.

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 149811 - 2³ = 149803 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (149861) 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, 24966 + ... + 24971.

It is an arithmetic number, because the mean of its divisors is an integer number (49938).

2¹⁴⁹⁸¹¹ is an apocalyptic number.

149811 is a deficient number, since it is larger than the sum of its proper divisors (49941).

149811 is an equidigital number, since it uses as much as digits as its factorization.

149811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49940.

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

The square root of 149811 is about 387.0542597621. The cubic root of 149811 is about 53.1106032500.

The spelling of 149811 in words is "one hundred forty-nine thousand, eight hundred eleven".