91672197971 has 2 divisors, whose sum is σ = 91672197972. Its totient is φ = 91672197970.

The previous prime is 91672197949. The next prime is 91672198003. The reversal of 91672197971 is 17979127619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91672197971 - 2¹⁰ = 91672196947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91672197971.

It is not a weakly prime, because it can be changed into another prime (91672197901) 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, 45836098985 + 45836098986.

It is an arithmetic number, because the mean of its divisors is an integer number (45836098986).

Almost surely, 2^91672197971 is an apocalyptic number.

91672197971 is a deficient number, since it is larger than the sum of its proper divisors (1).

91672197971 is an equidigital number, since it uses as much as digits as its factorization.

91672197971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000564, while the sum is 59.

The spelling of 91672197971 in words is "ninety-one billion, six hundred seventy-two million, one hundred ninety-seven thousand, nine hundred seventy-one".