3129999779 has 2 divisors, whose sum is σ = 3129999780. Its totient is φ = 3129999778.

The previous prime is 3129999739. The next prime is 3129999833. The reversal of 3129999779 is 9779999213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3129999779 - 2²⁸ = 2861564323 is a prime.

It is not a weakly prime, because it can be changed into another prime (3129999739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564999889 + 1564999890.

It is an arithmetic number, because the mean of its divisors is an integer number (1564999890).

Almost surely, 2^3129999779 is an apocalyptic number.

3129999779 is a deficient number, since it is larger than the sum of its proper divisors (1).

3129999779 is an equidigital number, since it uses as much as digits as its factorization.

3129999779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17360406, while the sum is 65.

The square root of 3129999779 is about 55946.4009476928. The cubic root of 3129999779 is about 1462.7881572512.

The spelling of 3129999779 in words is "three billion, one hundred twenty-nine million, nine hundred ninety-nine thousand, seven hundred seventy-nine".