91749777629 has 2 divisors, whose sum is σ = 91749777630. Its totient is φ = 91749777628.

The previous prime is 91749777547. The next prime is 91749777653. The reversal of 91749777629 is 92677794719.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91749621604 + 156025 = 302902^2 + 395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91749777629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91709777629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45874888814 + 45874888815.

It is an arithmetic number, because the mean of its divisors is an integer number (45874888815).

Almost surely, 2^91749777629 is an apocalyptic number.

It is an amenable number.

91749777629 is a deficient number, since it is larger than the sum of its proper divisors (1).

91749777629 is an equidigital number, since it uses as much as digits as its factorization.

91749777629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84015792, while the sum is 68.

The spelling of 91749777629 in words is "ninety-one billion, seven hundred forty-nine million, seven hundred seventy-seven thousand, six hundred twenty-nine".