31308130 has 16 divisors (see below), whose sum is σ = 64405440. Its totient is φ = 10734192.

The previous prime is 31308091. The next prime is 31308131. The reversal of 31308130 is 3180313.

It is a super-3 number, since 3×31308130³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31308098 and 31308107.

It is not an unprimeable number, because it can be changed into a prime (31308131) 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, 223560 + ... + 223699.

It is an arithmetic number, because the mean of its divisors is an integer number (4025340).

Almost surely, 2^31308130 is an apocalyptic number.

31308130 is an abundant number, since it is smaller than the sum of its proper divisors (33097310).

31308130 is a wasteful number, since it uses less digits than its factorization.

31308130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447273.

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

The square root of 31308130 is about 5595.3668333721. The cubic root of 31308130 is about 315.1754460611.

Adding to 31308130 its reverse (3180313), we get a palindrome (34488443).

The spelling of 31308130 in words is "thirty-one million, three hundred eight thousand, one hundred thirty".