31994000281 has 8 divisors (see below), whose sum is σ = 33147333000. Its totient is φ = 30844007040.

The previous prime is 31994000279. The next prime is 31994000303. The reversal of 31994000281 is 18200049913.

It can be written as a sum of positive squares in 4 ways, for example, as 985960000 + 31008040281 = 31400^2 + 176091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31994000281 - 2¹ = 31994000279 is a prime.

It is a super-2 number, since 2×31994000281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31994000281.

It is not an unprimeable number, because it can be changed into a prime (31994000251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 815356 + ... + 853693.

It is an arithmetic number, because the mean of its divisors is an integer number (4143416625).

Almost surely, 2^31994000281 is an apocalyptic number.

31994000281 is the 79993-rd centered decagonal number.

It is an amenable number.

31994000281 is a deficient number, since it is larger than the sum of its proper divisors (1153332719).

31994000281 is a wasteful number, since it uses less digits than its factorization.

31994000281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669739.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 31994000281 in words is "thirty-one billion, nine hundred ninety-four million, two hundred eighty-one", and thus it is an aban number.