31031021143 has 2 divisors, whose sum is σ = 31031021144. Its totient is φ = 31031021142.

The previous prime is 31031021117. The next prime is 31031021201. The reversal of 31031021143 is 34112013013.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031021143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31031021143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31031021243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515510571 + 15515510572.

It is an arithmetic number, because the mean of its divisors is an integer number (15515510572).

Almost surely, 2^31031021143 is an apocalyptic number.

31031021143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031021143 is an equidigital number, since it uses as much as digits as its factorization.

31031021143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31031021143 its reverse (34112013013), we get a palindrome (65143034156).

The spelling of 31031021143 in words is "thirty-one billion, thirty-one million, twenty-one thousand, one hundred forty-three".