91949899 has 4 divisors (see below), whose sum is σ = 93245040. Its totient is φ = 90654760.

The previous prime is 91949863. The next prime is 91949927. The reversal of 91949899 is 99894919.

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 91949899 - 2¹⁷ = 91818827 is a prime.

It is a super-2 number, since 2×91949899² = 16909567852220402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91949399) 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, 647464 + ... + 647605.

It is an arithmetic number, because the mean of its divisors is an integer number (23311260).

Almost surely, 2^91949899 is an apocalyptic number.

91949899 is a deficient number, since it is larger than the sum of its proper divisors (1295141).

91949899 is a wasteful number, since it uses less digits than its factorization.

91949899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295140.

The product of its digits is 1889568, while the sum is 58.

The square root of 91949899 is about 9589.0509957972. The cubic root of 91949899 is about 451.3537816305.

The spelling of 91949899 in words is "ninety-one million, nine hundred forty-nine thousand, eight hundred ninety-nine".