149917 has 4 divisors (see below), whose sum is σ = 150876. Its totient is φ = 148960.

The previous prime is 149911. The next prime is 149921. The reversal of 149917 is 719941.

149917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 68121 + 81796 = 261^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 149917 - 2³ = 149909 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149911) 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, 184 + ... + 577.

It is an arithmetic number, because the mean of its divisors is an integer number (37719).

2¹⁴⁹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

149917 is a deficient number, since it is larger than the sum of its proper divisors (959).

149917 is an equidigital number, since it uses as much as digits as its factorization.

149917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958.

The product of its digits is 2268, while the sum is 31.

The square root of 149917 is about 387.1911672546. The cubic root of 149917 is about 53.1231265775.

The spelling of 149917 in words is "one hundred forty-nine thousand, nine hundred seventeen".