31890110243 has 2 divisors, whose sum is σ = 31890110244. Its totient is φ = 31890110242.

The previous prime is 31890110171. The next prime is 31890110249. The reversal of 31890110243 is 34201109813.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31890110243 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31890110249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15945055121 + 15945055122.

It is an arithmetic number, because the mean of its divisors is an integer number (15945055122).

Almost surely, 2^31890110243 is an apocalyptic number.

31890110243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31890110243 is an equidigital number, since it uses as much as digits as its factorization.

31890110243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 31890110243 in words is "thirty-one billion, eight hundred ninety million, one hundred ten thousand, two hundred forty-three".