31809814 has 4 divisors (see below), whose sum is σ = 47714724. Its totient is φ = 15904906.

The previous prime is 31809803. The next prime is 31809821. The reversal of 31809814 is 41890813.

It is a happy number.

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

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 31809814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7952452 + ... + 7952455.

It is an arithmetic number, because the mean of its divisors is an integer number (11928681).

Almost surely, 2^31809814 is an apocalyptic number.

31809814 is a deficient number, since it is larger than the sum of its proper divisors (15904910).

31809814 is a wasteful number, since it uses less digits than its factorization.

31809814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15904909.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 31809814 is about 5640.0189715993. The cubic root of 31809814 is about 316.8499988574.

It can be divided in two parts, 31809 and 814, that added together give a palindrome (32623).

The spelling of 31809814 in words is "thirty-one million, eight hundred nine thousand, eight hundred fourteen".