31423201643 has 2 divisors, whose sum is σ = 31423201644. Its totient is φ = 31423201642.

The previous prime is 31423201559. The next prime is 31423201651. The reversal of 31423201643 is 34610232413.

It is a strong prime.

It is an emirp because it is prime and its reverse (34610232413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31423201643 - 2²² = 31419007339 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31423401643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711600821 + 15711600822.

It is an arithmetic number, because the mean of its divisors is an integer number (15711600822).

Almost surely, 2^31423201643 is an apocalyptic number.

31423201643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423201643 is an equidigital number, since it uses as much as digits as its factorization.

31423201643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 31423201643 in words is "thirty-one billion, four hundred twenty-three million, two hundred one thousand, six hundred forty-three".