31248005 has 8 divisors (see below), whose sum is σ = 38205432. Its totient is φ = 24526528.

The previous prime is 31248001. The next prime is 31248047. The reversal of 31248005 is 50084213.

It can be written as a sum of positive squares in 4 ways, for example, as 5013121 + 26234884 = 2239^2 + 5122^2 .

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 31248005 - 2² = 31248001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31248001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58694 + ... + 59223.

It is an arithmetic number, because the mean of its divisors is an integer number (4775679).

Almost surely, 2^31248005 is an apocalyptic number.

It is an amenable number.

31248005 is a deficient number, since it is larger than the sum of its proper divisors (6957427).

31248005 is a wasteful number, since it uses less digits than its factorization.

31248005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117975.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 31248005 is about 5589.9915026769. The cubic root of 31248005 is about 314.9735595511.

The spelling of 31248005 in words is "thirty-one million, two hundred forty-eight thousand, five".