312501321 has 20 divisors (see below), whose sum is σ = 509262864. Its totient is φ = 189394200.

The previous prime is 312501307. The next prime is 312501331. The reversal of 312501321 is 123105213.

It is not a de Polignac number, because 312501321 - 2¹⁴ = 312484937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312501294 and 312501303.

It is not an unprimeable number, because it can be changed into a prime (312501331) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 174475 + ... + 176256.

Almost surely, 2^312501321 is an apocalyptic number.

It is an amenable number.

312501321 is a deficient number, since it is larger than the sum of its proper divisors (196761543).

312501321 is a wasteful number, since it uses less digits than its factorization.

312501321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350754 (or 350745 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 312501321 is about 17677.7068931465. The cubic root of 312501321 is about 678.6053603462.

Adding to 312501321 its reverse (123105213), we get a palindrome (435606534).

The spelling of 312501321 in words is "three hundred twelve million, five hundred one thousand, three hundred twenty-one".