97812278020091 has 2 divisors, whose sum is σ = 97812278020092. Its totient is φ = 97812278020090.

The previous prime is 97812278020063. The next prime is 97812278020109. The reversal of 97812278020091 is 19002087221879.

Together with next prime (97812278020109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97812278020091 - 2³⁴ = 97795098150907 is a prime.

It is not a weakly prime, because it can be changed into another prime (97812278020291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48906139010045 + 48906139010046.

It is an arithmetic number, because the mean of its divisors is an integer number (48906139010046).

Almost surely, 2^{97812278020091} is an apocalyptic number.

97812278020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

97812278020091 is an equidigital number, since it uses as much as digits as its factorization.

97812278020091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 97812278020091 in words is "ninety-seven trillion, eight hundred twelve billion, two hundred seventy-eight million, twenty thousand, ninety-one".