31345232143420 has 48 divisors (see below), whose sum is σ = 74619419041440. Its totient is φ = 10964486059776.

The previous prime is 31345232143411. The next prime is 31345232143471. The reversal of 31345232143420 is 2434123254313.

It is a self number, because there is not a number n which added to its sum of digits gives 31345232143420.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3172589407 + ... + 3172599286.

It is an arithmetic number, because the mean of its divisors is an integer number (1554571230030).

Almost surely, 2^{31345232143420} is an apocalyptic number.

It is an amenable number.

31345232143420 is an abundant number, since it is smaller than the sum of its proper divisors (43274186898020).

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

31345232143420 is a wasteful number, since it uses less digits than its factorization.

31345232143420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345188734 (or 6345188732 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 37.

Adding to 31345232143420 its reverse (2434123254313), we get a palindrome (33779355397733).

The spelling of 31345232143420 in words is "thirty-one trillion, three hundred forty-five billion, two hundred thirty-two million, one hundred forty-three thousand, four hundred twenty".