3956397691 has 2 divisors, whose sum is σ = 3956397692. Its totient is φ = 3956397690.

The previous prime is 3956397677. The next prime is 3956397713. The reversal of 3956397691 is 1967936593.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3956397691 - 2¹⁷ = 3956266619 is a prime.

It is not a weakly prime, because it can be changed into another prime (3956397611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1978198845 + 1978198846.

It is an arithmetic number, because the mean of its divisors is an integer number (1978198846).

Almost surely, 2^3956397691 is an apocalyptic number.

3956397691 is a deficient number, since it is larger than the sum of its proper divisors (1).

3956397691 is an equidigital number, since it uses as much as digits as its factorization.

3956397691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8266860, while the sum is 58.

The square root of 3956397691 is about 62899.9021541369. The cubic root of 3956397691 is about 1581.6121038462.

The spelling of 3956397691 in words is "three billion, nine hundred fifty-six million, three hundred ninety-seven thousand, six hundred ninety-one".