31423404121 has 2 divisors, whose sum is σ = 31423404122. Its totient is φ = 31423404120.

The previous prime is 31423404119. The next prime is 31423404139. The reversal of 31423404121 is 12140432413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25192038400 + 6231365721 = 158720^2 + 78939^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423404121 - 2¹ = 31423404119 is a prime.

Together with 31423404119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31423404161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711702060 + 15711702061.

It is an arithmetic number, because the mean of its divisors is an integer number (15711702061).

Almost surely, 2^31423404121 is an apocalyptic number.

It is an amenable number.

31423404121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423404121 is an equidigital number, since it uses as much as digits as its factorization.

31423404121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 31423404121 its reverse (12140432413), we get a palindrome (43563836534).

The spelling of 31423404121 in words is "thirty-one billion, four hundred twenty-three million, four hundred four thousand, one hundred twenty-one".