31294481 has 4 divisors (see below), whose sum is σ = 31384500. Its totient is φ = 31204464.

The previous prime is 31294477. The next prime is 31294493. The reversal of 31294481 is 18449213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15928081 + 15366400 = 3991^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 31294481 - 2² = 31294477 is a prime.

It is a super-2 number, since 2×31294481² = 1958689082118722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31294381) 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 3 ways as a sum of consecutive naturals, for example, 44486 + ... + 45183.

It is an arithmetic number, because the mean of its divisors is an integer number (7846125).

Almost surely, 2^31294481 is an apocalyptic number.

It is an amenable number.

31294481 is a deficient number, since it is larger than the sum of its proper divisors (90019).

31294481 is an equidigital number, since it uses as much as digits as its factorization.

31294481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90018.

The product of its digits is 6912, while the sum is 32.

The square root of 31294481 is about 5594.1470306026. The cubic root of 31294481 is about 315.1296384179.

The spelling of 31294481 in words is "thirty-one million, two hundred ninety-four thousand, four hundred eighty-one".