61138139 has 2 divisors, whose sum is σ = 61138140. Its totient is φ = 61138138.

The previous prime is 61138111. The next prime is 61138153. The reversal of 61138139 is 93183116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61138139 - 2¹² = 61134043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61138109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30569069 + 30569070.

It is an arithmetic number, because the mean of its divisors is an integer number (30569070).

Almost surely, 2^61138139 is an apocalyptic number.

61138139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61138139 is an equidigital number, since it uses as much as digits as its factorization.

61138139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 61138139 is about 7819.0881181887. The cubic root of 61138139 is about 393.9466438952.

The spelling of 61138139 in words is "sixty-one million, one hundred thirty-eight thousand, one hundred thirty-nine".