31431504227 has 2 divisors, whose sum is σ = 31431504228. Its totient is φ = 31431504226.

The previous prime is 31431504211. The next prime is 31431504263. The reversal of 31431504227 is 72240513413.

It is a weak prime.

It is an emirp because it is prime and its reverse (72240513413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31431504227 - 2⁴ = 31431504211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31431504193 and 31431504202.

It is not a weakly prime, because it can be changed into another prime (31431504287) 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, 15715752113 + 15715752114.

It is an arithmetic number, because the mean of its divisors is an integer number (15715752114).

Almost surely, 2^31431504227 is an apocalyptic number.

31431504227 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431504227 is an equidigital number, since it uses as much as digits as its factorization.

31431504227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 31431504227 in words is "thirty-one billion, four hundred thirty-one million, five hundred four thousand, two hundred twenty-seven".