149917213 has 4 divisors (see below), whose sum is σ = 151244028. Its totient is φ = 148590400.

The previous prime is 149917181. The next prime is 149917219. The reversal of 149917213 is 312719941.

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 6827769 + 143089444 = 2613^2 + 11962^2 .

It is a cyclic number.

It is not a de Polignac number, because 149917213 - 2⁵ = 149917181 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 (149917219) 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, 663238 + ... + 663463.

It is an arithmetic number, because the mean of its divisors is an integer number (37811007).

Almost surely, 2^149917213 is an apocalyptic number.

It is an amenable number.

149917213 is a deficient number, since it is larger than the sum of its proper divisors (1326815).

149917213 is a wasteful number, since it uses less digits than its factorization.

149917213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326814.

The product of its digits is 13608, while the sum is 37.

The square root of 149917213 is about 12244.0684823305. The cubic root of 149917213 is about 531.2315173639.

The spelling of 149917213 in words is "one hundred forty-nine million, nine hundred seventeen thousand, two hundred thirteen".