31813030 has 16 divisors (see below), whose sum is σ = 60277680. Its totient is φ = 12055392.

The previous prime is 31813027. The next prime is 31813039. The reversal of 31813030 is 3031813.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 31812989 and 31813007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31813039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83529 + ... + 83908.

It is an arithmetic number, because the mean of its divisors is an integer number (3767355).

Almost surely, 2^31813030 is an apocalyptic number.

31813030 is a deficient number, since it is larger than the sum of its proper divisors (28464650).

31813030 is a wasteful number, since it uses less digits than its factorization.

31813030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167463.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31813030 is about 5640.3040698175. The cubic root of 31813030 is about 316.8606764349.

Adding to 31813030 its reverse (3031813), we get a palindrome (34844843).

The spelling of 31813030 in words is "thirty-one million, eight hundred thirteen thousand, thirty".