149817 has 4 divisors (see below), whose sum is σ = 199760. Its totient is φ = 99876.

The previous prime is 149803. The next prime is 149827. The reversal of 149817 is 718941.

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 not a de Polignac number, because 149817 - 2⁷ = 149689 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149827) 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, 24967 + ... + 24972.

It is an arithmetic number, because the mean of its divisors is an integer number (49940).

2¹⁴⁹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

149817 is a deficient number, since it is larger than the sum of its proper divisors (49943).

149817 is an equidigital number, since it uses as much as digits as its factorization.

149817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49942.

The product of its digits is 2016, while the sum is 30.

The square root of 149817 is about 387.0620105358. The cubic root of 149817 is about 53.1113122753. Note that the first 3 decimals are identical.

The spelling of 149817 in words is "one hundred forty-nine thousand, eight hundred seventeen".