139000831 has 2 divisors, whose sum is σ = 139000832. Its totient is φ = 139000830.

The previous prime is 139000819. The next prime is 139000837. The reversal of 139000831 is 138000931.

It is a strong prime.

It is an emirp because it is prime and its reverse (138000931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139000831 - 2⁹ = 139000319 is a prime.

It is a super-2 number, since 2×139000831² = 38642462037381122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139000796 and 139000805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139000837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69500415 + 69500416.

It is an arithmetic number, because the mean of its divisors is an integer number (69500416).

Almost surely, 2^139000831 is an apocalyptic number.

139000831 is a deficient number, since it is larger than the sum of its proper divisors (1).

139000831 is an equidigital number, since it uses as much as digits as its factorization.

139000831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 139000831 is about 11789.8613647490. The cubic root of 139000831 is about 518.0111790296.

The spelling of 139000831 in words is "one hundred thirty-nine million, eight hundred thirty-one", and thus it is an aban number.