31143324991 has 2 divisors, whose sum is σ = 31143324992. Its totient is φ = 31143324990.

The previous prime is 31143324983. The next prime is 31143325001. The reversal of 31143324991 is 19942334113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31143324991 - 2³ = 31143324983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143324941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571662495 + 15571662496.

It is an arithmetic number, because the mean of its divisors is an integer number (15571662496).

Almost surely, 2^31143324991 is an apocalyptic number.

31143324991 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143324991 is an equidigital number, since it uses as much as digits as its factorization.

31143324991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 40.

The spelling of 31143324991 in words is "thirty-one billion, one hundred forty-three million, three hundred twenty-four thousand, nine hundred ninety-one".