149813 has 4 divisors (see below), whose sum is σ = 153900. Its totient is φ = 145728.

The previous prime is 149803. The next prime is 149827. The reversal of 149813 is 318941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88804 + 61009 = 298^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 149813 - 2⁶ = 149749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149803) 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, 1988 + ... + 2061.

It is an arithmetic number, because the mean of its divisors is an integer number (38475).

2¹⁴⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

149813 is a deficient number, since it is larger than the sum of its proper divisors (4087).

149813 is an equidigital number, since it uses as much as digits as its factorization.

149813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086.

The product of its digits is 864, while the sum is 26.

The square root of 149813 is about 387.0568433706. The cubic root of 149813 is about 53.1108395938.

The spelling of 149813 in words is "one hundred forty-nine thousand, eight hundred thirteen".