139128331 has 2 divisors, whose sum is σ = 139128332. Its totient is φ = 139128330.

The previous prime is 139128281. The next prime is 139128337. The reversal of 139128331 is 133821931.

It is a strong prime.

It is an emirp because it is prime and its reverse (133821931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139128331 - 2¹³ = 139120139 is a prime.

It is a super-2 number, since 2×139128331² = 38713384973691122, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 139128293 and 139128302.

It is not a weakly prime, because it can be changed into another prime (139128337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69564165 + 69564166.

It is an arithmetic number, because the mean of its divisors is an integer number (69564166).

Almost surely, 2^139128331 is an apocalyptic number.

139128331 is a deficient number, since it is larger than the sum of its proper divisors (1).

139128331 is an equidigital number, since it uses as much as digits as its factorization.

139128331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 139128331 is about 11795.2673136305. The cubic root of 139128331 is about 518.1695143940.

The spelling of 139128331 in words is "one hundred thirty-nine million, one hundred twenty-eight thousand, three hundred thirty-one".