312111431 has 4 divisors (see below), whose sum is σ = 312265512. Its totient is φ = 311957352.

The previous prime is 312111419. The next prime is 312111451. The reversal of 312111431 is 134111213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134111213 = 2243 ⋅59791.

It is a cyclic number.

It is not a de Polignac number, because 312111431 - 2⁶ = 312111367 is a prime.

It is a super-2 number, since 2×312111431² = 194827090721735522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312111451) 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, 73961 + ... + 78066.

It is an arithmetic number, because the mean of its divisors is an integer number (78066378).

Almost surely, 2^312111431 is an apocalyptic number.

312111431 is a deficient number, since it is larger than the sum of its proper divisors (154081).

312111431 is a wasteful number, since it uses less digits than its factorization.

312111431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154080.

The product of its digits is 72, while the sum is 17.

The square root of 312111431 is about 17666.6757201235. The cubic root of 312111431 is about 678.3230238814.

Adding to 312111431 its reverse (134111213), we get a palindrome (446222644).

The spelling of 312111431 in words is "three hundred twelve million, one hundred eleven thousand, four hundred thirty-one".