312111031 has 4 divisors (see below), whose sum is σ = 312206464. Its totient is φ = 312015600.

The previous prime is 312111029. The next prime is 312111047. The reversal of 312111031 is 130111213.

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 312111031 - 2¹ = 312111029 is a prime.

It is a super-2 number, since 2×312111031² = 194826591343765922, 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 (312111061) 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, 42630 + ... + 49411.

It is an arithmetic number, because the mean of its divisors is an integer number (78051616).

Almost surely, 2^312111031 is an apocalyptic number.

312111031 is a deficient number, since it is larger than the sum of its proper divisors (95433).

312111031 is an equidigital number, since it uses as much as digits as its factorization.

312111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95432.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 312111031 is about 17666.6643993709. The cubic root of 312111031 is about 678.3227341032.

Adding to 312111031 its reverse (130111213), we get a palindrome (442222244).

The spelling of 312111031 in words is "three hundred twelve million, one hundred eleven thousand, thirty-one".