3945967261 has 2 divisors, whose sum is σ = 3945967262. Its totient is φ = 3945967260.

The previous prime is 3945967243. The next prime is 3945967301. The reversal of 3945967261 is 1627695493.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2024460036 + 1921507225 = 44994^2 + 43835^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945967261 - 2⁵ = 3945967229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3945967199 and 3945967208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945967241) 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, 1972983630 + 1972983631.

It is an arithmetic number, because the mean of its divisors is an integer number (1972983631).

Almost surely, 2^3945967261 is an apocalyptic number.

It is an amenable number.

3945967261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945967261 is an equidigital number, since it uses as much as digits as its factorization.

3945967261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 52.

The square root of 3945967261 is about 62816.9345081404. The cubic root of 3945967261 is about 1580.2209888247.

The spelling of 3945967261 in words is "three billion, nine hundred forty-five million, nine hundred sixty-seven thousand, two hundred sixty-one".