91787816232229 has 16 divisors (see below), whose sum is σ = 100569655404400. Its totient is φ = 83254654517760.

The previous prime is 91787816232223. The next prime is 91787816232251. The reversal of 91787816232229 is 92223261878719.

It can be written as a sum of positive squares in 8 ways, for example, as 326614536004 + 91461201696225 = 571502^2 + 9563535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91787816232229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91787816232223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57257304 + ... + 58838545.

It is an arithmetic number, because the mean of its divisors is an integer number (6285603462775).

Almost surely, 2^{91787816232229} is an apocalyptic number.

It is an amenable number.

91787816232229 is a deficient number, since it is larger than the sum of its proper divisors (8781839172171).

91787816232229 is a wasteful number, since it uses less digits than its factorization.

91787816232229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116096920.

The product of its digits is 73156608, while the sum is 67.

The spelling of 91787816232229 in words is "ninety-one trillion, seven hundred eighty-seven billion, eight hundred sixteen million, two hundred thirty-two thousand, two hundred twenty-nine".