312212431 has 4 divisors (see below), whose sum is σ = 314595864. Its totient is φ = 309829000.

The previous prime is 312212393. The next prime is 312212437. The reversal of 312212431 is 134212213.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 312212431 - 2¹³ = 312204239 is a prime.

It is a super-2 number, since 2×312212431² = 194953204141859522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312212399 and 312212408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312212437) 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, 1191520 + ... + 1191781.

It is an arithmetic number, because the mean of its divisors is an integer number (78648966).

Almost surely, 2^312212431 is an apocalyptic number.

312212431 is a deficient number, since it is larger than the sum of its proper divisors (2383433).

312212431 is a wasteful number, since it uses less digits than its factorization.

312212431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383432.

The product of its digits is 288, while the sum is 19.

The square root of 312212431 is about 17669.5339780086. The cubic root of 312212431 is about 678.3961849706.

Adding to 312212431 its reverse (134212213), we get a palindrome (446424644).

The spelling of 312212431 in words is "three hundred twelve million, two hundred twelve thousand, four hundred thirty-one".