139431133 has 4 divisors (see below), whose sum is σ = 143199580. Its totient is φ = 135662688.

The previous prime is 139431107. The next prime is 139431151. The reversal of 139431133 is 331134931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331134931 = 829 ⋅399439.

It can be written as a sum of positive squares in 2 ways, for example, as 52606009 + 86825124 = 7253^2 + 9318^2 .

It is a cyclic number.

It is not a de Polignac number, because 139431133 - 2¹⁷ = 139300061 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 (139431163) 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, 1884168 + ... + 1884241.

It is an arithmetic number, because the mean of its divisors is an integer number (35799895).

Almost surely, 2^139431133 is an apocalyptic number.

It is an amenable number.

139431133 is a deficient number, since it is larger than the sum of its proper divisors (3768447).

139431133 is an equidigital number, since it uses as much as digits as its factorization.

139431133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3768446.

The product of its digits is 2916, while the sum is 28.

The square root of 139431133 is about 11808.0960785387. The cubic root of 139431133 is about 518.5451605635.

The spelling of 139431133 in words is "one hundred thirty-nine million, four hundred thirty-one thousand, one hundred thirty-three".