312721441 has 4 divisors (see below), whose sum is σ = 317848084. Its totient is φ = 307594800.

The previous prime is 312721433. The next prime is 312721469. The reversal of 312721441 is 144127213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71571600 + 241149841 = 8460^2 + 15529^2 .

It is a cyclic number.

It is not a de Polignac number, because 312721441 - 2³ = 312721433 is a prime.

It is a super-2 number, since 2×312721441² = 195589399322232962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312724441) 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, 2563230 + ... + 2563351.

It is an arithmetic number, because the mean of its divisors is an integer number (79462021).

Almost surely, 2^312721441 is an apocalyptic number.

It is an amenable number.

312721441 is a deficient number, since it is larger than the sum of its proper divisors (5126643).

312721441 is an equidigital number, since it uses as much as digits as its factorization.

312721441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126642.

The product of its digits is 1344, while the sum is 25.

The square root of 312721441 is about 17683.9317178053. The cubic root of 312721441 is about 678.7646551965.

Adding to 312721441 its reverse (144127213), we get a palindrome (456848654).

The spelling of 312721441 in words is "three hundred twelve million, seven hundred twenty-one thousand, four hundred forty-one".