149913217 has 4 divisors (see below), whose sum is σ = 149998896. Its totient is φ = 149827540.

The previous prime is 149913199. The next prime is 149913223. The reversal of 149913217 is 712319941.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149913217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149913227) 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, 40159 + ... + 43732.

It is an arithmetic number, because the mean of its divisors is an integer number (37499724).

Almost surely, 2^149913217 is an apocalyptic number.

It is an amenable number.

149913217 is a deficient number, since it is larger than the sum of its proper divisors (85679).

149913217 is an equidigital number, since it uses as much as digits as its factorization.

149913217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85678.

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

The square root of 149913217 is about 12243.9053001892. The cubic root of 149913217 is about 531.2267973811.

The spelling of 149913217 in words is "one hundred forty-nine million, nine hundred thirteen thousand, two hundred seventeen".