31211040431 has 2 divisors, whose sum is σ = 31211040432. Its totient is φ = 31211040430.

The previous prime is 31211040397. The next prime is 31211040439. The reversal of 31211040431 is 13404011213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31211040431 - 2¹⁰ = 31211039407 is a prime.

It is a super-2 number, since 2×31211040431² (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 (31211040439) 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, 15605520215 + 15605520216.

It is an arithmetic number, because the mean of its divisors is an integer number (15605520216).

Almost surely, 2^31211040431 is an apocalyptic number.

31211040431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211040431 is an equidigital number, since it uses as much as digits as its factorization.

31211040431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31211040431 its reverse (13404011213), we get a palindrome (44615051644).

The spelling of 31211040431 in words is "thirty-one billion, two hundred eleven million, forty thousand, four hundred thirty-one".