61142281139 has 4 divisors (see below), whose sum is σ = 61149630360. Its totient is φ = 61134931920.

The previous prime is 61142281129. The next prime is 61142281229. The reversal of 61142281139 is 93118224116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61142281139 - 2⁸ = 61142280883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61142281129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3662117 + ... + 3678774.

It is an arithmetic number, because the mean of its divisors is an integer number (15287407590).

Almost surely, 2^61142281139 is an apocalyptic number.

61142281139 is a deficient number, since it is larger than the sum of its proper divisors (7349221).

61142281139 is an equidigital number, since it uses as much as digits as its factorization.

61142281139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7349220.

The product of its digits is 20736, while the sum is 38.

The spelling of 61142281139 in words is "sixty-one billion, one hundred forty-two million, two hundred eighty-one thousand, one hundred thirty-nine".