31240013 has 8 divisors (see below), whose sum is σ = 35821632. Its totient is φ = 26688096.

The previous prime is 31239977. The next prime is 31240019. The reversal of 31240013 is 31004213.

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 31240013 - 2¹² = 31235917 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31240013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240019) 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, 5120 + ... + 9417.

It is an arithmetic number, because the mean of its divisors is an integer number (4477704).

Almost surely, 2^31240013 is an apocalyptic number.

It is an amenable number.

31240013 is a deficient number, since it is larger than the sum of its proper divisors (4581619).

31240013 is a wasteful number, since it uses less digits than its factorization.

31240013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14851.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31240013 is about 5589.2766079342. The cubic root of 31240013 is about 314.9467046812.

Adding to 31240013 its reverse (31004213), we get a palindrome (62244226).

The spelling of 31240013 in words is "thirty-one million, two hundred forty thousand, thirteen".