139951 has 4 divisors (see below), whose sum is σ = 159952. Its totient is φ = 119952.

The previous prime is 139943. The next prime is 139967. The reversal of 139951 is 159931.

139951 is nontrivially palindromic in base 11.

139951 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.

It is not a de Polignac number, because 139951 - 2³ = 139943 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139901) 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, 9990 + ... + 10003.

It is an arithmetic number, because the mean of its divisors is an integer number (39988).

2¹³⁹⁹⁵¹ is an apocalyptic number.

139951 is a deficient number, since it is larger than the sum of its proper divisors (20001).

139951 is an equidigital number, since it uses as much as digits as its factorization.

139951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20000.

The product of its digits is 1215, while the sum is 28.

The square root of 139951 is about 374.1002539427. The cubic root of 139951 is about 51.9188824018.

The spelling of 139951 in words is "one hundred thirty-nine thousand, nine hundred fifty-one".