91823899469 has 4 divisors (see below), whose sum is σ = 94990240860. Its totient is φ = 88657558080.

The previous prime is 91823899393. The next prime is 91823899477. The reversal of 91823899469 is 96499832819.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26719825444 + 65104074025 = 163462^2 + 255155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91823899469 is a prime.

It is a super-2 number, since 2×91823899469² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91823899399 and 91823899408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91823899499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1583170652 + ... + 1583170709.

It is an arithmetic number, because the mean of its divisors is an integer number (23747560215).

Almost surely, 2^91823899469 is an apocalyptic number.

It is an amenable number.

91823899469 is a deficient number, since it is larger than the sum of its proper divisors (3166341391).

91823899469 is a wasteful number, since it uses less digits than its factorization.

91823899469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166341390.

The product of its digits is 60466176, while the sum is 68.

The spelling of 91823899469 in words is "ninety-one billion, eight hundred twenty-three million, eight hundred ninety-nine thousand, four hundred sixty-nine".