139061539 has 2 divisors, whose sum is σ = 139061540. Its totient is φ = 139061538.

The previous prime is 139061501. The next prime is 139061597. The reversal of 139061539 is 935160931.

It is a weak prime.

It is an emirp because it is prime and its reverse (935160931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139061539 is a prime.

It is a super-2 number, since 2×139061539² = 38676223258097042, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 139061498 and 139061507.

It is not a weakly prime, because it can be changed into another prime (139061599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69530769 + 69530770.

It is an arithmetic number, because the mean of its divisors is an integer number (69530770).

Almost surely, 2^139061539 is an apocalyptic number.

139061539 is a deficient number, since it is larger than the sum of its proper divisors (1).

139061539 is an equidigital number, since it uses as much as digits as its factorization.

139061539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 139061539 is about 11792.4356686819. The cubic root of 139061539 is about 518.0865810862.

The spelling of 139061539 in words is "one hundred thirty-nine million, sixty-one thousand, five hundred thirty-nine".