689180891 has 4 divisors (see below), whose sum is σ = 787635312. Its totient is φ = 590726472.

The previous prime is 689180879. The next prime is 689180893. The reversal of 689180891 is 198081986.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198081986 = 2 ⋅99040993.

It is not a de Polignac number, because 689180891 - 2¹⁴ = 689164507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689180893) 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, 49227200 + ... + 49227213.

It is an arithmetic number, because the mean of its divisors is an integer number (196908828).

Almost surely, 2^689180891 is an apocalyptic number.

689180891 is a deficient number, since it is larger than the sum of its proper divisors (98454421).

689180891 is an equidigital number, since it uses as much as digits as its factorization.

689180891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98454420.

The product of its (nonzero) digits is 248832, while the sum is 50.

The square root of 689180891 is about 26252.2549698116. The cubic root of 689180891 is about 883.3057869975.

The spelling of 689180891 in words is "six hundred eighty-nine million, one hundred eighty thousand, eight hundred ninety-one".