31240140431 has 2 divisors, whose sum is σ = 31240140432. Its totient is φ = 31240140430.

The previous prime is 31240140427. The next prime is 31240140439. The reversal of 31240140431 is 13404104213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31240140431 - 2² = 31240140427 is a prime.

It is a super-2 number, since 2×31240140431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31240140397 and 31240140406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31240140439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620070215 + 15620070216.

It is an arithmetic number, because the mean of its divisors is an integer number (15620070216).

Almost surely, 2^31240140431 is an apocalyptic number.

31240140431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240140431 is an equidigital number, since it uses as much as digits as its factorization.

31240140431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31240140431 its reverse (13404104213), we get a palindrome (44644244644).

The spelling of 31240140431 in words is "thirty-one billion, two hundred forty million, one hundred forty thousand, four hundred thirty-one".