31794281 has 2 divisors, whose sum is σ = 31794282. Its totient is φ = 31794280.

The previous prime is 31794221. The next prime is 31794283. The reversal of 31794281 is 18249713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31360000 + 434281 = 5600^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 31794281 - 2¹⁰ = 31793257 is a prime.

It is a super-2 number, since 2×31794281² = 2021752608613922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 31794283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31794283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15897140 + 15897141.

It is an arithmetic number, because the mean of its divisors is an integer number (15897141).

Almost surely, 2^31794281 is an apocalyptic number.

It is an amenable number.

31794281 is a deficient number, since it is larger than the sum of its proper divisors (1).

31794281 is an equidigital number, since it uses as much as digits as its factorization.

31794281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 31794281 is about 5638.6417690788. The cubic root of 31794281 is about 316.7984169532.

The spelling of 31794281 in words is "thirty-one million, seven hundred ninety-four thousand, two hundred eighty-one".