312213133 has 4 divisors (see below), whose sum is σ = 312454048. Its totient is φ = 311972220.

The previous prime is 312213061. The next prime is 312213163. The reversal of 312213133 is 331312213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331312213 = 1009 ⋅328357.

It is a cyclic number.

It is not a de Polignac number, because 312213133 - 2¹⁷ = 312082061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312213133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312213163) 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, 118503 + ... + 121108.

It is an arithmetic number, because the mean of its divisors is an integer number (78113512).

Almost surely, 2^312213133 is an apocalyptic number.

It is an amenable number.

312213133 is a deficient number, since it is larger than the sum of its proper divisors (240915).

312213133 is a wasteful number, since it uses less digits than its factorization.

312213133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240914.

The product of its digits is 324, while the sum is 19.

The square root of 312213133 is about 17669.5538426979. The cubic root of 312213133 is about 678.3966934211.

Adding to 312213133 its reverse (331312213), we get a palindrome (643525346).

The spelling of 312213133 in words is "three hundred twelve million, two hundred thirteen thousand, one hundred thirty-three".