31008009 has 8 divisors (see below), whose sum is σ = 41380480. Its totient is φ = 20653776.

The previous prime is 31008007. The next prime is 31008011. The reversal of 31008009 is 90080013.

It is an interprime number because it is at equal distance from previous prime (31008007) and next prime (31008011).

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

It is not a de Polignac number, because 31008009 - 2¹ = 31008007 is a prime.

It is a super-2 number, since 2×31008009² = 1922993244288162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31008007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87 + ... + 7875.

It is an arithmetic number, because the mean of its divisors is an integer number (5172560).

Almost surely, 2^31008009 is an apocalyptic number.

It is an amenable number.

31008009 is a deficient number, since it is larger than the sum of its proper divisors (10372471).

31008009 is a wasteful number, since it uses less digits than its factorization.

31008009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 31008009 is about 5568.4835458139. The cubic root of 31008009 is about 314.1651159394.

The spelling of 31008009 in words is "thirty-one million, eight thousand, nine".