31431471431 has 2 divisors, whose sum is σ = 31431471432. Its totient is φ = 31431471430.

The previous prime is 31431471397. The next prime is 31431471439. The reversal of 31431471431 is 13417413413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31431471431 - 2⁶ = 31431471367 is a prime.

It is a super-2 number, since 2×31431471431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31431471439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715735715 + 15715735716.

It is an arithmetic number, because the mean of its divisors is an integer number (15715735716).

Almost surely, 2^31431471431 is an apocalyptic number.

31431471431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431471431 is an equidigital number, since it uses as much as digits as its factorization.

31431471431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

Adding to 31431471431 its reverse (13417413413), we get a palindrome (44848884844).

The spelling of 31431471431 in words is "thirty-one billion, four hundred thirty-one million, four hundred seventy-one thousand, four hundred thirty-one".