91823943751 has 2 divisors, whose sum is σ = 91823943752. Its totient is φ = 91823943750.

The previous prime is 91823943749. The next prime is 91823943767. The reversal of 91823943751 is 15734932819.

It is a weak prime.

It is an emirp because it is prime and its reverse (15734932819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91823943751 - 2¹ = 91823943749 is a prime.

Together with 91823943749, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91823913751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45911971875 + 45911971876.

It is an arithmetic number, because the mean of its divisors is an integer number (45911971876).

Almost surely, 2^91823943751 is an apocalyptic number.

91823943751 is a deficient number, since it is larger than the sum of its proper divisors (1).

91823943751 is an equidigital number, since it uses as much as digits as its factorization.

91823943751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 52.

The spelling of 91823943751 in words is "ninety-one billion, eight hundred twenty-three million, nine hundred forty-three thousand, seven hundred fifty-one".