91097866 has 8 divisors (see below), whose sum is σ = 144684900. Its totient is φ = 42869568.

The previous prime is 91097863. The next prime is 91097879. The reversal of 91097866 is 66879019.

It can be written as a sum of positive squares in 2 ways, for example, as 90155025 + 942841 = 9495^2 + 971^2 .

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

It is not an unprimeable number, because it can be changed into a prime (91097861) 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, 1339641 + ... + 1339708.

Almost surely, 2^91097866 is an apocalyptic number.

91097866 is a deficient number, since it is larger than the sum of its proper divisors (53587034).

91097866 is a wasteful number, since it uses less digits than its factorization.

91097866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679368.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 91097866 is about 9544.5202079518. The cubic root of 91097866 is about 449.9553305454.

The spelling of 91097866 in words is "ninety-one million, ninety-seven thousand, eight hundred sixty-six".