31140311420 has 12 divisors (see below), whose sum is σ = 65394654024. Its totient is φ = 12456124560.

The previous prime is 31140311417. The next prime is 31140311429. The reversal of 31140311420 is 2411304113.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1557015571 = 31140311420 / (3 + 1 + 1 + 4 + 0 + 3 + 1 + 1 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 31140311392 and 31140311401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140311429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778507766 + ... + 778507805.

It is an arithmetic number, because the mean of its divisors is an integer number (5449554502).

Almost surely, 2^31140311420 is an apocalyptic number.

It is an amenable number.

31140311420 is an abundant number, since it is smaller than the sum of its proper divisors (34254342604).

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

31140311420 is a wasteful number, since it uses less digits than its factorization.

31140311420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557015580 (or 1557015578 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31140311420 its reverse (2411304113), we get a palindrome (33551615533).

The spelling of 31140311420 in words is "thirty-one billion, one hundred forty million, three hundred eleven thousand, four hundred twenty".