971434991 has 2 divisors, whose sum is σ = 971434992. Its totient is φ = 971434990.

The previous prime is 971434967. The next prime is 971435027. The reversal of 971434991 is 199434179.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 971434991 - 2²⁶ = 904326127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971434901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485717495 + 485717496.

It is an arithmetic number, because the mean of its divisors is an integer number (485717496).

Almost surely, 2^971434991 is an apocalyptic number.

971434991 is a deficient number, since it is larger than the sum of its proper divisors (1).

971434991 is an equidigital number, since it uses as much as digits as its factorization.

971434991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 971434991 is about 31167.8518829899. The cubic root of 971434991 is about 990.3862013952.

The spelling of 971434991 in words is "nine hundred seventy-one million, four hundred thirty-four thousand, nine hundred ninety-one".