3981956249 has 2 divisors, whose sum is σ = 3981956250. Its totient is φ = 3981956248.

The previous prime is 3981956129. The next prime is 3981956269. The reversal of 3981956249 is 9426591893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2911357849 + 1070598400 = 53957^2 + 32720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3981956249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3981956194 and 3981956203.

It is not a weakly prime, because it can be changed into another prime (3981956269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990978124 + 1990978125.

It is an arithmetic number, because the mean of its divisors is an integer number (1990978125).

Almost surely, 2^3981956249 is an apocalyptic number.

It is an amenable number.

3981956249 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981956249 is an equidigital number, since it uses as much as digits as its factorization.

3981956249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 56.

The square root of 3981956249 is about 63102.7435932860. The cubic root of 3981956249 is about 1585.0105648007.

The spelling of 3981956249 in words is "three billion, nine hundred eighty-one million, nine hundred fifty-six thousand, two hundred forty-nine".