312243431 has 4 divisors (see below), whose sum is σ = 313059072. Its totient is φ = 311427792.

The previous prime is 312243401. The next prime is 312243457. The reversal of 312243431 is 134342213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312243431 is a prime.

It is a super-2 number, since 2×312243431² = 194991920405303522, 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 = 312243397 and 312243406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312243401) 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, 407246 + ... + 408011.

It is an arithmetic number, because the mean of its divisors is an integer number (78264768).

Almost surely, 2^312243431 is an apocalyptic number.

312243431 is a deficient number, since it is larger than the sum of its proper divisors (815641).

312243431 is an equidigital number, since it uses as much as digits as its factorization.

312243431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815640.

The product of its digits is 1728, while the sum is 23.

The square root of 312243431 is about 17670.4111723525. The cubic root of 312243431 is about 678.4186371897.

Adding to 312243431 its reverse (134342213), we get a palindrome (446585644).

The spelling of 312243431 in words is "three hundred twelve million, two hundred forty-three thousand, four hundred thirty-one".