31123130010 has 128 divisors (see below), whose sum is σ = 87369891840. Its totient is φ = 6948834816.

The previous prime is 31123129937. The next prime is 31123130011. The reversal of 31123130010 is 1003132113.

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 (31123130011) 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 63 ways as a sum of consecutive naturals, for example, 1541239 + ... + 1561301.

It is an arithmetic number, because the mean of its divisors is an integer number (682577280).

Almost surely, 2^31123130010 is an apocalyptic number.

31123130010 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31123130010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43684945920).

31123130010 is an abundant number, since it is smaller than the sum of its proper divisors (56246761830).

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

31123130010 is a wasteful number, since it uses less digits than its factorization.

31123130010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20252.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31123130010 its reverse (1003132113), we get a palindrome (32126262123).

The spelling of 31123130010 in words is "thirty-one billion, one hundred twenty-three million, one hundred thirty thousand, ten".