31405144502143 has 2 divisors, whose sum is σ = 31405144502144. Its totient is φ = 31405144502142.

The previous prime is 31405144502141. The next prime is 31405144502177. The reversal of 31405144502143 is 34120544150413.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31405144502143 - 2¹ = 31405144502141 is a prime.

Together with 31405144502141, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31405144502141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702572251071 + 15702572251072.

It is an arithmetic number, because the mean of its divisors is an integer number (15702572251072).

Almost surely, 2^{31405144502143} is an apocalyptic number.

31405144502143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405144502143 is an equidigital number, since it uses as much as digits as its factorization.

31405144502143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 31405144502143 its reverse (34120544150413), we get a palindrome (65525688652556).

The spelling of 31405144502143 in words is "thirty-one trillion, four hundred five billion, one hundred forty-four million, five hundred two thousand, one hundred forty-three".