31793481 has 12 divisors (see below), whose sum is σ = 46791108. Its totient is φ = 20795424.

The previous prime is 31793477. The next prime is 31793497. The reversal of 31793481 is 18439713.

It is a happy number.

31793481 is a `hidden beast` number, since 3 + 179 + 3 + 481 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8173881 + 23619600 = 2859^2 + 4860^2 .

It is not a de Polignac number, because 31793481 - 2² = 31793477 is a prime.

It is a super-2 number, since 2×31793481² = 2021650868194722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31793431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32850 + ... + 33803.

It is an arithmetic number, because the mean of its divisors is an integer number (3899259).

Almost surely, 2^31793481 is an apocalyptic number.

It is an amenable number.

31793481 is a deficient number, since it is larger than the sum of its proper divisors (14997627).

31793481 is a wasteful number, since it uses less digits than its factorization.

31793481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66712 (or 66709 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 31793481 is about 5638.5708295631. The cubic root of 31793481 is about 316.7957598625.

The spelling of 31793481 in words is "thirty-one million, seven hundred ninety-three thousand, four hundred eighty-one".