91099474657 has 8 divisors (see below), whose sum is σ = 93243997184. Its totient is φ = 88979184288.

The previous prime is 91099474649. The next prime is 91099474663. The reversal of 91099474657 is 75647499019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91099474657 - 2³ = 91099474649 is a prime.

It is a super-2 number, since 2×91099474657² (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 = 91099474595 and 91099474604.

It is not an unprimeable number, because it can be changed into a prime (91099474057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6050433 + ... + 6065470.

It is an arithmetic number, because the mean of its divisors is an integer number (11655499648).

Almost surely, 2^91099474657 is an apocalyptic number.

It is an amenable number.

91099474657 is a deficient number, since it is larger than the sum of its proper divisors (2144522527).

91099474657 is a wasteful number, since it uses less digits than its factorization.

91099474657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12116079.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 91099474657 in words is "ninety-one billion, ninety-nine million, four hundred seventy-four thousand, six hundred fifty-seven".