91397000843 has 2 divisors, whose sum is σ = 91397000844. Its totient is φ = 91397000842.

The previous prime is 91397000809. The next prime is 91397000857. The reversal of 91397000843 is 34800079319.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (34800079319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91397000843 - 2²² = 91392806539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91397000794 and 91397000803.

It is not a weakly prime, because it can be changed into another prime (91397000803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45698500421 + 45698500422.

It is an arithmetic number, because the mean of its divisors is an integer number (45698500422).

Almost surely, 2^91397000843 is an apocalyptic number.

91397000843 is the 161597-th centered heptagonal number.

91397000843 is a deficient number, since it is larger than the sum of its proper divisors (1).

91397000843 is an equidigital number, since it uses as much as digits as its factorization.

91397000843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 91397000843 in words is "ninety-one billion, three hundred ninety-seven million, eight hundred forty-three", and thus it is an aban number.