7191964397 has 2 divisors, whose sum is σ = 7191964398. Its totient is φ = 7191964396.

The previous prime is 7191964387. The next prime is 7191964433. The reversal of 7191964397 is 7934691917.

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., 4648376041 + 2543588356 = 68179^2 + 50434^2 .

It is a cyclic number.

It is not a de Polignac number, because 7191964397 - 2⁸ = 7191964141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7191964387) 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, 3595982198 + 3595982199.

It is an arithmetic number, because the mean of its divisors is an integer number (3595982199).

Almost surely, 2^7191964397 is an apocalyptic number.

It is an amenable number.

7191964397 is a deficient number, since it is larger than the sum of its proper divisors (1).

7191964397 is an equidigital number, since it uses as much as digits as its factorization.

7191964397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 56.

The square root of 7191964397 is about 84805.4502788588. The cubic root of 7191964397 is about 1930.2601416729.

The spelling of 7191964397 in words is "seven billion, one hundred ninety-one million, nine hundred sixty-four thousand, three hundred ninety-seven".