684192091 has 4 divisors (see below), whose sum is σ = 746391384. Its totient is φ = 621992800.

The previous prime is 684192077. The next prime is 684192101. The reversal of 684192091 is 190291486.

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

It is not a de Polignac number, because 684192091 - 2²⁷ = 549974363 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684192001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31099630 + ... + 31099651.

It is an arithmetic number, because the mean of its divisors is an integer number (186597846).

Almost surely, 2^684192091 is an apocalyptic number.

684192091 is a deficient number, since it is larger than the sum of its proper divisors (62199293).

684192091 is a wasteful number, since it uses less digits than its factorization.

684192091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62199292.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 684192091 is about 26157.0657949243. The cubic root of 684192091 is about 881.1692837159.

The spelling of 684192091 in words is "six hundred eighty-four million, one hundred ninety-two thousand, ninety-one".