61090492139 has 2 divisors, whose sum is σ = 61090492140. Its totient is φ = 61090492138.

The previous prime is 61090492093. The next prime is 61090492187. The reversal of 61090492139 is 93129409016.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61090492139 - 2²⁰ = 61089443563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61090492139.

It is not a weakly prime, because it can be changed into another prime (61090492439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30545246069 + 30545246070.

It is an arithmetic number, because the mean of its divisors is an integer number (30545246070).

Almost surely, 2^61090492139 is an apocalyptic number.

61090492139 is a deficient number, since it is larger than the sum of its proper divisors (1).

61090492139 is an equidigital number, since it uses as much as digits as its factorization.

61090492139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The spelling of 61090492139 in words is "sixty-one billion, ninety million, four hundred ninety-two thousand, one hundred thirty-nine".