91685092190431 has 2 divisors, whose sum is σ = 91685092190432. Its totient is φ = 91685092190430.

The previous prime is 91685092190387. The next prime is 91685092190473. The reversal of 91685092190431 is 13409129058619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91685092190431 - 2⁹ = 91685092189919 is a prime.

It is a super-2 number, since 2×91685092190431² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91685096190431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45842546095215 + 45842546095216.

It is an arithmetic number, because the mean of its divisors is an integer number (45842546095216).

Almost surely, 2^{91685092190431} is an apocalyptic number.

91685092190431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91685092190431 is an equidigital number, since it uses as much as digits as its factorization.

91685092190431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 91685092190431 in words is "ninety-one trillion, six hundred eighty-five billion, ninety-two million, one hundred ninety thousand, four hundred thirty-one".