3972647291 has 2 divisors, whose sum is σ = 3972647292. Its totient is φ = 3972647290.

The previous prime is 3972647279. The next prime is 3972647351. The reversal of 3972647291 is 1927462793.

3972647291 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3972647291 is a prime.

It is not a weakly prime, because it can be changed into another prime (3972647491) 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, 1986323645 + 1986323646.

It is an arithmetic number, because the mean of its divisors is an integer number (1986323646).

Almost surely, 2^3972647291 is an apocalyptic number.

3972647291 is a deficient number, since it is larger than the sum of its proper divisors (1).

3972647291 is an equidigital number, since it uses as much as digits as its factorization.

3972647291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 50.

The square root of 3972647291 is about 63028.9401069064. The cubic root of 3972647291 is about 1583.7744630241.

The spelling of 3972647291 in words is "three billion, nine hundred seventy-two million, six hundred forty-seven thousand, two hundred ninety-one".