99186491 has 4 divisors (see below), whose sum is σ = 99705984. Its totient is φ = 98667000.

The previous prime is 99186463. The next prime is 99186499. The reversal of 99186491 is 19468199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19468199 = 47 ⋅414217.

It is a cyclic number.

It is not a de Polignac number, because 99186491 - 2¹⁰ = 99185467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99186499) 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, 259460 + ... + 259841.

It is an arithmetic number, because the mean of its divisors is an integer number (24926496).

Almost surely, 2^99186491 is an apocalyptic number.

99186491 is a deficient number, since it is larger than the sum of its proper divisors (519493).

99186491 is a wasteful number, since it uses less digits than its factorization.

99186491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519492.

The product of its digits is 139968, while the sum is 47.

The square root of 99186491 is about 9959.2414871816. The cubic root of 99186491 is about 462.8967966559.

The spelling of 99186491 in words is "ninety-nine million, one hundred eighty-six thousand, four hundred ninety-one".