31385689 has 12 divisors (see below), whose sum is σ = 33558784. Its totient is φ = 29346624.

The previous prime is 31385597. The next prime is 31385729. The reversal of 31385689 is 98658313.

It is not a de Polignac number, because 31385689 - 2⁹ = 31385177 is a prime.

It is a super-2 number, since 2×31385689² = 1970122948009442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31385489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64204 + ... + 64690.

Almost surely, 2^31385689 is an apocalyptic number.

It is an amenable number.

31385689 is a deficient number, since it is larger than the sum of its proper divisors (2173095).

31385689 is a wasteful number, since it uses less digits than its factorization.

31385689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 727 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 31385689 is about 5602.2931911852. The cubic root of 31385689 is about 315.4354907067.

The spelling of 31385689 in words is "thirty-one million, three hundred eighty-five thousand, six hundred eighty-nine".