312021023 has 4 divisors (see below), whose sum is σ = 312221208. Its totient is φ = 311820840.

The previous prime is 312021019. The next prime is 312021041. The reversal of 312021023 is 320120213.

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 312021023 - 2² = 312021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312020989 and 312021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312026023) 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, 97736 + ... + 100877.

It is an arithmetic number, because the mean of its divisors is an integer number (78055302).

Almost surely, 2^312021023 is an apocalyptic number.

312021023 is a deficient number, since it is larger than the sum of its proper divisors (200185).

312021023 is a wasteful number, since it uses less digits than its factorization.

312021023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200184.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 312021023 is about 17664.1168191336. The cubic root of 312021023 is about 678.2575219013.

Adding to 312021023 its reverse (320120213), we get a palindrome (632141236).

The spelling of 312021023 in words is "three hundred twelve million, twenty-one thousand, twenty-three".