139910831 has 4 divisors (see below), whose sum is σ = 142550712. Its totient is φ = 137270952.

The previous prime is 139910821. The next prime is 139910861. The reversal of 139910831 is 138019931.

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 139910831 - 2⁶ = 139910767 is a prime.

It is a super-2 number, since 2×139910831² = 39150081262221122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139910791 and 139910800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139910821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1319861 + ... + 1319966.

It is an arithmetic number, because the mean of its divisors is an integer number (35637678).

Almost surely, 2^139910831 is an apocalyptic number.

139910831 is a deficient number, since it is larger than the sum of its proper divisors (2639881).

139910831 is an equidigital number, since it uses as much as digits as its factorization.

139910831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639880.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 139910831 is about 11828.3908880287. The cubic root of 139910831 is about 519.1391464133.

The spelling of 139910831 in words is "one hundred thirty-nine million, nine hundred ten thousand, eight hundred thirty-one".