971891929 has 2 divisors, whose sum is σ = 971891930. Its totient is φ = 971891928.

The previous prime is 971891917. The next prime is 971891951. The reversal of 971891929 is 929198179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 586947529 + 384944400 = 24227^2 + 19620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971891929 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 971891929.

It is not a weakly prime, because it can be changed into another prime (971891909) 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, 485945964 + 485945965.

It is an arithmetic number, because the mean of its divisors is an integer number (485945965).

Almost surely, 2^971891929 is an apocalyptic number.

It is an amenable number.

971891929 is a deficient number, since it is larger than the sum of its proper divisors (1).

971891929 is an equidigital number, since it uses as much as digits as its factorization.

971891929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 55.

The square root of 971891929 is about 31175.1812985907. The cubic root of 971891929 is about 990.5414611081.

The spelling of 971891929 in words is "nine hundred seventy-one million, eight hundred ninety-one thousand, nine hundred twenty-nine".