312220013 has 12 divisors (see below), whose sum is σ = 370924992. Its totient is φ = 261921240.

The previous prime is 312220001. The next prime is 312220019. The reversal of 312220013 is 310022213.

It is a happy number.

It is not a de Polignac number, because 312220013 - 2¹⁰ = 312218989 is a prime.

It is a Duffinian number.

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 312220013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312220019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65483 + ... + 70088.

It is an arithmetic number, because the mean of its divisors is an integer number (30910416).

Almost surely, 2^312220013 is an apocalyptic number.

It is an amenable number.

312220013 is a deficient number, since it is larger than the sum of its proper divisors (58704979).

312220013 is a wasteful number, since it uses less digits than its factorization.

312220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135632 (or 135625 counting only the distinct ones).

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

The square root of 312220013 is about 17669.7485267901. The cubic root of 312220013 is about 678.4016764861.

Adding to 312220013 its reverse (310022213), we get a palindrome (622242226).

It can be divided in two parts, 3122200 and 13, that added together give a palindrome (3122213).

The spelling of 312220013 in words is "three hundred twelve million, two hundred twenty thousand, thirteen".