31242230431 has 2 divisors, whose sum is σ = 31242230432. Its totient is φ = 31242230430.

The previous prime is 31242230419. The next prime is 31242230441. The reversal of 31242230431 is 13403224213.

It is a strong prime.

It is an emirp because it is prime and its reverse (13403224213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31242230431 - 2¹³ = 31242222239 is a prime.

It is a super-2 number, since 2×31242230431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31242230396 and 31242230405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31242230441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621115215 + 15621115216.

It is an arithmetic number, because the mean of its divisors is an integer number (15621115216).

Almost surely, 2^31242230431 is an apocalyptic number.

31242230431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31242230431 is an equidigital number, since it uses as much as digits as its factorization.

31242230431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31242230431 its reverse (13403224213), we get a palindrome (44645454644).

The spelling of 31242230431 in words is "thirty-one billion, two hundred forty-two million, two hundred thirty thousand, four hundred thirty-one".