31131030 has 32 divisors (see below), whose sum is σ = 85388544. Its totient is φ = 7115616.

The previous prime is 31130993. The next prime is 31131031. The reversal of 31131030 is 3013113.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31130997 and 31131015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131031) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 73912 + ... + 74331.

It is an arithmetic number, because the mean of its divisors is an integer number (2668392).

Almost surely, 2^31131030 is an apocalyptic number.

31131030 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31131030 is an abundant number, since it is smaller than the sum of its proper divisors (54257514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31131030 is a wasteful number, since it uses less digits than its factorization.

31131030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148260.

The product of its (nonzero) digits is 27, while the sum is 12.

The square root of 31131030 is about 5579.5187964555. The cubic root of 31131030 is about 314.5800400028.

Adding to 31131030 its reverse (3013113), we get a palindrome (34144143).

The spelling of 31131030 in words is "thirty-one million, one hundred thirty-one thousand, thirty".