31009894 has 4 divisors (see below), whose sum is σ = 46514844. Its totient is φ = 15504946.

The previous prime is 31009883. The next prime is 31009907. The reversal of 31009894 is 49890013.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×31009894² = 1923227051782472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7752472 + ... + 7752475.

It is an arithmetic number, because the mean of its divisors is an integer number (11628711).

Almost surely, 2^31009894 is an apocalyptic number.

31009894 is a deficient number, since it is larger than the sum of its proper divisors (15504950).

31009894 is a wasteful number, since it uses less digits than its factorization.

31009894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15504949.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 31009894 is about 5568.6527993762. The cubic root of 31009894 is about 314.1714819210.

The spelling of 31009894 in words is "thirty-one million, nine thousand, eight hundred ninety-four".