31201402231 has 2 divisors, whose sum is σ = 31201402232. Its totient is φ = 31201402230.

The previous prime is 31201402229. The next prime is 31201402241. The reversal of 31201402231 is 13220410213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31201402231 - 2¹ = 31201402229 is a prime.

It is a super-2 number, since 2×31201402231² (a number of 22 digits) contains 22 as substring.

Together with 31201402229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31201402199 and 31201402208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31201402241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600701115 + 15600701116.

It is an arithmetic number, because the mean of its divisors is an integer number (15600701116).

Almost surely, 2^31201402231 is an apocalyptic number.

31201402231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201402231 is an equidigital number, since it uses as much as digits as its factorization.

31201402231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31201402231 its reverse (13220410213), we get a palindrome (44421812444).

The spelling of 31201402231 in words is "thirty-one billion, two hundred one million, four hundred two thousand, two hundred thirty-one".