31121312010 has 64 divisors (see below), whose sum is σ = 81333417600. Its totient is φ = 7591110912.

The previous prime is 31121312003. The next prime is 31121312011. The reversal of 31121312010 is 1021312113.

It is a happy number.

It is a super-2 number, since 2×31121312010² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (31121312011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 924829 + ... + 957888.

It is an arithmetic number, because the mean of its divisors is an integer number (1270834650).

Almost surely, 2^31121312010 is an apocalyptic number.

31121312010 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31121312010 is an abundant number, since it is smaller than the sum of its proper divisors (50212105590).

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

31121312010 is a wasteful number, since it uses less digits than its factorization.

31121312010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882775.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31121312010 its reverse (1021312113), we get a palindrome (32142624123).

The spelling of 31121312010 in words is "thirty-one billion, one hundred twenty-one million, three hundred twelve thousand, ten".