149871 has 4 divisors (see below), whose sum is σ = 199832. Its totient is φ = 99912.

The previous prime is 149867. The next prime is 149873. The reversal of 149871 is 178941.

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

It is not a de Polignac number, because 149871 - 2² = 149867 is a prime.

It is a super-2 number, since 2×149871² = 44922633282, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149873) 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, 24976 + ... + 24981.

It is an arithmetic number, because the mean of its divisors is an integer number (49958).

2¹⁴⁹⁸⁷¹ is an apocalyptic number.

149871 is a deficient number, since it is larger than the sum of its proper divisors (49961).

149871 is an equidigital number, since it uses as much as digits as its factorization.

149871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49960.

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

The square root of 149871 is about 387.1317605157. The cubic root of 149871 is about 53.1176926512.

The spelling of 149871 in words is "one hundred forty-nine thousand, eight hundred seventy-one".