31230013 has 8 divisors (see below), whose sum is σ = 32398200. Its totient is φ = 30067968.

The previous prime is 31229999. The next prime is 31230029. The reversal of 31230013 is 31003213.

It can be written as a sum of positive squares in 4 ways, for example, as 6260004 + 24970009 = 2502^2 + 4997^2 .

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 31230013 - 2⁵ = 31229981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31229975 and 31230002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10545 + ... + 13177.

It is an arithmetic number, because the mean of its divisors is an integer number (4049775).

Almost surely, 2^31230013 is an apocalyptic number.

It is an amenable number.

31230013 is a deficient number, since it is larger than the sum of its proper divisors (1168187).

31230013 is a wasteful number, since it uses less digits than its factorization.

31230013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 31230013 is about 5588.3819661866. The cubic root of 31230013 is about 314.9130960401.

Adding to 31230013 its reverse (31003213), we get a palindrome (62233226).

The spelling of 31230013 in words is "thirty-one million, two hundred thirty thousand, thirteen".