31450217429 has 2 divisors, whose sum is σ = 31450217430. Its totient is φ = 31450217428.

The previous prime is 31450217401. The next prime is 31450217431. The reversal of 31450217429 is 92471205413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26267657329 + 5182560100 = 162073^2 + 71990^2 .

It is an emirp because it is prime and its reverse (92471205413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31450217429 is a prime.

It is a Sophie Germain prime.

Together with 31450217431, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31450217392 and 31450217401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31450217129) 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, 15725108714 + 15725108715.

It is an arithmetic number, because the mean of its divisors is an integer number (15725108715).

Almost surely, 2^31450217429 is an apocalyptic number.

It is an amenable number.

31450217429 is a deficient number, since it is larger than the sum of its proper divisors (1).

31450217429 is an equidigital number, since it uses as much as digits as its factorization.

31450217429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 31450217429 in words is "thirty-one billion, four hundred fifty million, two hundred seventeen thousand, four hundred twenty-nine".