3961390049 has 2 divisors, whose sum is σ = 3961390050. Its totient is φ = 3961390048.

The previous prime is 3961390001. The next prime is 3961390067. The reversal of 3961390049 is 9400931693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2752576225 + 1208813824 = 52465^2 + 34768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3961390049 is a prime.

It is a super-2 number, since 2×3961390049² = 31385222240632444802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3961389991 and 3961390009.

It is not a weakly prime, because it can be changed into another prime (3961390249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1980695024 + 1980695025.

It is an arithmetic number, because the mean of its divisors is an integer number (1980695025).

Almost surely, 2^3961390049 is an apocalyptic number.

It is an amenable number.

3961390049 is a deficient number, since it is larger than the sum of its proper divisors (1).

3961390049 is an equidigital number, since it uses as much as digits as its factorization.

3961390049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 3961390049 is about 62939.5745854705. The cubic root of 3961390049 is about 1582.2770736511.

The spelling of 3961390049 in words is "three billion, nine hundred sixty-one million, three hundred ninety thousand, forty-nine".