31210031124 has 36 divisors (see below), whose sum is σ = 78903033300. Its totient is φ = 10401891840.

The previous prime is 31210031117. The next prime is 31210031141. The reversal of 31210031124 is 42113001213.

It can be written as a sum of positive squares in 2 ways, for example, as 3830372100 + 27379659024 = 61890^2 + 165468^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31210031124² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31210031097 and 31210031106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218694 + ... + 332034.

It is an arithmetic number, because the mean of its divisors is an integer number (2191750925).

Almost surely, 2^31210031124 is an apocalyptic number.

It is an amenable number.

31210031124 is an abundant number, since it is smaller than the sum of its proper divisors (47693002176).

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

31210031124 is a wasteful number, since it uses less digits than its factorization.

31210031124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121000 (or 120995 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31210031124 its reverse (42113001213), we get a palindrome (73323032337).

The spelling of 31210031124 in words is "thirty-one billion, two hundred ten million, thirty-one thousand, one hundred twenty-four".