31240147 has 4 divisors (see below), whose sum is σ = 31329000. Its totient is φ = 31151296.

The previous prime is 31240129. The next prime is 31240159. The reversal of 31240147 is 74104213.

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

It is a cyclic number.

It is not a de Polignac number, because 31240147 - 2⁷ = 31240019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31240117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43897 + ... + 44602.

It is an arithmetic number, because the mean of its divisors is an integer number (7832250).

Almost surely, 2^31240147 is an apocalyptic number.

31240147 is a deficient number, since it is larger than the sum of its proper divisors (88853).

31240147 is an equidigital number, since it uses as much as digits as its factorization.

31240147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88852.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 31240147 is about 5589.2885951613. The cubic root of 31240147 is about 314.9471549883.

The spelling of 31240147 in words is "thirty-one million, two hundred forty thousand, one hundred forty-seven".