101239 has 4 divisors (see below), whose sum is σ = 104760. Its totient is φ = 97720.

The previous prime is 101221. The next prime is 101267. The reversal of 101239 is 932101.

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

It is a cyclic number.

It is not a de Polignac number, because 101239 - 2⁵ = 101207 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 (101209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1717 + ... + 1774.

It is an arithmetic number, because the mean of its divisors is an integer number (26190).

2¹⁰¹²³⁹ is an apocalyptic number.

101239 is a deficient number, since it is larger than the sum of its proper divisors (3521).

101239 is an equidigital number, since it uses as much as digits as its factorization.

101239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 101239 is about 318.1807662320. The cubic root of 101239 is about 46.6067996488.

The spelling of 101239 in words is "one hundred one thousand, two hundred thirty-nine".