312212113 has 4 divisors (see below), whose sum is σ = 312685108. Its totient is φ = 311739120.

The previous prime is 312212111. The next prime is 312212119. The reversal of 312212113 is 311212213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 206698129 + 105513984 = 14377^2 + 10272^2 .

It is a cyclic number.

It is not a de Polignac number, because 312212113 - 2¹ = 312212111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312212111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235506 + ... + 236827.

It is an arithmetic number, because the mean of its divisors is an integer number (78171277).

Almost surely, 2^312212113 is an apocalyptic number.

It is an amenable number.

312212113 is a deficient number, since it is larger than the sum of its proper divisors (472995).

312212113 is an equidigital number, since it uses as much as digits as its factorization.

312212113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472994.

The product of its digits is 72, while the sum is 16.

The square root of 312212113 is about 17669.5249794668. The cubic root of 312212113 is about 678.3959546466.

Adding to 312212113 its reverse (311212213), we get a palindrome (623424326).

The spelling of 312212113 in words is "three hundred twelve million, two hundred twelve thousand, one hundred thirteen".