61000139 has 2 divisors, whose sum is σ = 61000140. Its totient is φ = 61000138.

The previous prime is 61000133. The next prime is 61000141. The reversal of 61000139 is 93100016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61000139 - 2¹² = 60996043 is a prime.

Together with 61000141, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61000139.

It is not a weakly prime, because it can be changed into another prime (61000133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30500069 + 30500070.

It is an arithmetic number, because the mean of its divisors is an integer number (30500070).

Almost surely, 2^61000139 is an apocalyptic number.

61000139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61000139 is an equidigital number, since it uses as much as digits as its factorization.

61000139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 61000139 is about 7810.2585744647. The cubic root of 61000139 is about 393.6500173117.

The spelling of 61000139 in words is "sixty-one million, one hundred thirty-nine", and thus it is an aban number.