31845489 has 16 divisors (see below), whose sum is σ = 45881472. Its totient is φ = 19531008.

The previous prime is 31845469. The next prime is 31845497. The reversal of 31845489 is 98454813.

It is not a de Polignac number, because 31845489 - 2⁹ = 31844977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31845489.

It is not an unprimeable number, because it can be changed into a prime (31845469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11932 + ... + 14354.

It is an arithmetic number, because the mean of its divisors is an integer number (2867592).

Almost surely, 2^31845489 is an apocalyptic number.

31845489 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31845489 is a deficient number, since it is larger than the sum of its proper divisors (14035983).

31845489 is a wasteful number, since it uses less digits than its factorization.

31845489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776.

The product of its digits is 138240, while the sum is 42.

The square root of 31845489 is about 5643.1807520227. The cubic root of 31845489 is about 316.9684046701.

The spelling of 31845489 in words is "thirty-one million, eight hundred forty-five thousand, four hundred eighty-nine".