31212013 has 8 divisors (see below), whose sum is σ = 35828480. Its totient is φ = 26634960.

The previous prime is 31212001. The next prime is 31212037. The reversal of 31212013 is 31021213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31211984 and 31212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212043) 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, 8133 + ... + 11338.

It is an arithmetic number, because the mean of its divisors is an integer number (4478560).

Almost surely, 2^31212013 is an apocalyptic number.

It is an amenable number.

31212013 is a deficient number, since it is larger than the sum of its proper divisors (4616467).

31212013 is a wasteful number, since it uses less digits than its factorization.

31212013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19707.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31212013 is about 5586.7712500155. The cubic root of 31212013 is about 314.8525824020.

Adding to 31212013 its reverse (31021213), we get a palindrome (62233226).

The spelling of 31212013 in words is "thirty-one million, two hundred twelve thousand, thirteen".