249779722139 has 2 divisors, whose sum is σ = 249779722140. Its totient is φ = 249779722138.

The previous prime is 249779722133. The next prime is 249779722261. The reversal of 249779722139 is 931227977942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249779722139 - 2³⁶ = 181060245403 is a prime.

It is not a weakly prime, because it can be changed into another prime (249779722133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124889861069 + 124889861070.

It is an arithmetic number, because the mean of its divisors is an integer number (124889861070).

Almost surely, 2^249779722139 is an apocalyptic number.

249779722139 is a deficient number, since it is larger than the sum of its proper divisors (1).

249779722139 is an equidigital number, since it uses as much as digits as its factorization.

249779722139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24004512, while the sum is 62.

The spelling of 249779722139 in words is "two hundred forty-nine billion, seven hundred seventy-nine million, seven hundred twenty-two thousand, one hundred thirty-nine".