971199641 has 2 divisors, whose sum is σ = 971199642. Its totient is φ = 971199640.

The previous prime is 971199623. The next prime is 971199667. The reversal of 971199641 is 146991179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817960000 + 153239641 = 28600^2 + 12379^2 .

It is an emirp because it is prime and its reverse (146991179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 971199641 - 2⁶ = 971199577 is a prime.

It is not a weakly prime, because it can be changed into another prime (971199601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485599820 + 485599821.

It is an arithmetic number, because the mean of its divisors is an integer number (485599821).

Almost surely, 2^971199641 is an apocalyptic number.

It is an amenable number.

971199641 is a deficient number, since it is larger than the sum of its proper divisors (1).

971199641 is an equidigital number, since it uses as much as digits as its factorization.

971199641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 47.

The square root of 971199641 is about 31164.0761294154. The cubic root of 971199641 is about 990.3062144959.

The spelling of 971199641 in words is "nine hundred seventy-one million, one hundred ninety-nine thousand, six hundred forty-one".