31429699381 has 2 divisors, whose sum is σ = 31429699382. Its totient is φ = 31429699380.

The previous prime is 31429699361. The next prime is 31429699403. The reversal of 31429699381 is 18399692413.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25100064900 + 6329634481 = 158430^2 + 79559^2 .

It is a cyclic number.

It is not a de Polignac number, because 31429699381 - 2⁹ = 31429698869 is a prime.

It is a super-2 number, since 2×31429699381² (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 (31429699361) 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, 15714849690 + 15714849691.

It is an arithmetic number, because the mean of its divisors is an integer number (15714849691).

Almost surely, 2^31429699381 is an apocalyptic number.

It is an amenable number.

31429699381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31429699381 is an equidigital number, since it uses as much as digits as its factorization.

31429699381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 55.

The spelling of 31429699381 in words is "thirty-one billion, four hundred twenty-nine million, six hundred ninety-nine thousand, three hundred eighty-one".