312123011 has 4 divisors (see below), whose sum is σ = 315340872. Its totient is φ = 308905152.

The previous prime is 312122999. The next prime is 312123017. The reversal of 312123011 is 110321213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110321213 = 659 ⋅167407.

It is a cyclic number.

It is not a de Polignac number, because 312123011 - 2²² = 307928707 is a prime.

It is a super-2 number, since 2×312123011² = 194841547991412242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312123017) 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, 1608785 + ... + 1608978.

It is an arithmetic number, because the mean of its divisors is an integer number (78835218).

Almost surely, 2^312123011 is an apocalyptic number.

312123011 is a deficient number, since it is larger than the sum of its proper divisors (3217861).

312123011 is an equidigital number, since it uses as much as digits as its factorization.

312123011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217860.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 312123011 is about 17667.0034527647. The cubic root of 312123011 is about 678.3314128548.

Adding to 312123011 its reverse (110321213), we get a palindrome (422444224).

The spelling of 312123011 in words is "three hundred twelve million, one hundred twenty-three thousand, eleven".