91749777671 has 2 divisors, whose sum is σ = 91749777672. Its totient is φ = 91749777670.

The previous prime is 91749777667. The next prime is 91749777701. The reversal of 91749777671 is 17677794719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91749777671 - 2² = 91749777667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91749777598 and 91749777607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91749707671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45874888835 + 45874888836.

It is an arithmetic number, because the mean of its divisors is an integer number (45874888836).

Almost surely, 2^91749777671 is an apocalyptic number.

91749777671 is a deficient number, since it is larger than the sum of its proper divisors (1).

91749777671 is an equidigital number, since it uses as much as digits as its factorization.

91749777671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32672808, while the sum is 65.

The spelling of 91749777671 in words is "ninety-one billion, seven hundred forty-nine million, seven hundred seventy-seven thousand, six hundred seventy-one".