91098199 has 4 divisors (see below), whose sum is σ = 91246464. Its totient is φ = 90949936.

The previous prime is 91098143. The next prime is 91098211. The reversal of 91098199 is 99189019.

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

It is a cyclic number.

It is not a de Polignac number, because 91098199 - 2¹⁵ = 91065431 is a prime.

It is a super-2 number, since 2×91098199² = 16597763722087202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91098109) 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, 73207 + ... + 74440.

It is an arithmetic number, because the mean of its divisors is an integer number (22811616).

Almost surely, 2^91098199 is an apocalyptic number.

91098199 is a deficient number, since it is larger than the sum of its proper divisors (148265).

91098199 is a wasteful number, since it uses less digits than its factorization.

91098199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148264.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 91098199 is about 9544.5376525005. The cubic root of 91098199 is about 449.9558788018.

The spelling of 91098199 in words is "ninety-one million, ninety-eight thousand, one hundred ninety-nine".