61612139 has 2 divisors, whose sum is σ = 61612140. Its totient is φ = 61612138.

The previous prime is 61612123. The next prime is 61612151. The reversal of 61612139 is 93121616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61612139 - 2⁴ = 61612123 is a prime.

It is not a weakly prime, because it can be changed into another prime (61612039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30806069 + 30806070.

It is an arithmetic number, because the mean of its divisors is an integer number (30806070).

Almost surely, 2^61612139 is an apocalyptic number.

61612139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61612139 is an equidigital number, since it uses as much as digits as its factorization.

61612139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 61612139 is about 7849.3400359521. The cubic root of 61612139 is about 394.9621050010.

The spelling of 61612139 in words is "sixty-one million, six hundred twelve thousand, one hundred thirty-nine".