31689869 has 8 divisors (see below), whose sum is σ = 32114880. Its totient is φ = 31267456.

The previous prime is 31689863. The next prime is 31689893. The reversal of 31689869 is 96898613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31689869 - 2⁸ = 31689613 is a prime.

It is a super-2 number, since 2×31689869² = 2008495594474322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31689863) 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 7 ways as a sum of consecutive naturals, for example, 37352 + ... + 38190.

It is an arithmetic number, because the mean of its divisors is an integer number (4014360).

Almost surely, 2^31689869 is an apocalyptic number.

It is an amenable number.

31689869 is a deficient number, since it is larger than the sum of its proper divisors (425011).

31689869 is a wasteful number, since it uses less digits than its factorization.

31689869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299.

The product of its digits is 559872, while the sum is 50.

The square root of 31689869 is about 5629.3755426335. The cubic root of 31689869 is about 316.4512493680.

The spelling of 31689869 in words is "thirty-one million, six hundred eighty-nine thousand, eight hundred sixty-nine".