31820089 has 4 divisors (see below), whose sum is σ = 36365824. Its totient is φ = 27274356.

The previous prime is 31820083. The next prime is 31820123. The reversal of 31820089 is 98002813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31820089 - 2¹¹ = 31818041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31820089.

It is not an unprimeable number, because it can be changed into a prime (31820083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2272857 + ... + 2272870.

It is an arithmetic number, because the mean of its divisors is an integer number (9091456).

Almost surely, 2^31820089 is an apocalyptic number.

It is an amenable number.

31820089 is a deficient number, since it is larger than the sum of its proper divisors (4545735).

31820089 is an equidigital number, since it uses as much as digits as its factorization.

31820089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545734.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 31820089 is about 5640.9297992441. The cubic root of 31820089 is about 316.8841107960.

The spelling of 31820089 in words is "thirty-one million, eight hundred twenty thousand, eighty-nine".