39721125139 has 2 divisors, whose sum is σ = 39721125140. Its totient is φ = 39721125138.

The previous prime is 39721125113. The next prime is 39721125193. The reversal of 39721125139 is 93152112793.

Together with next prime (39721125193) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39721125139 - 2⁹ = 39721124627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39721125095 and 39721125104.

It is not a weakly prime, because it can be changed into another prime (39721125539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19860562569 + 19860562570.

It is an arithmetic number, because the mean of its divisors is an integer number (19860562570).

Almost surely, 2^39721125139 is an apocalyptic number.

39721125139 is a deficient number, since it is larger than the sum of its proper divisors (1).

39721125139 is an equidigital number, since it uses as much as digits as its factorization.

39721125139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 43.

The spelling of 39721125139 in words is "thirty-nine billion, seven hundred twenty-one million, one hundred twenty-five thousand, one hundred thirty-nine".