312104561 has 4 divisors (see below), whose sum is σ = 312846324. Its totient is φ = 311362800.

The previous prime is 312104543. The next prime is 312104563. The reversal of 312104561 is 165401213.

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 85451536 + 226653025 = 9244^2 + 15055^2 .

It is a cyclic number.

It is not a de Polignac number, because 312104561 - 2¹⁴ = 312088177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (312104563) 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, 370250 + ... + 371091.

It is an arithmetic number, because the mean of its divisors is an integer number (78211581).

Almost surely, 2^312104561 is an apocalyptic number.

It is an amenable number.

312104561 is a deficient number, since it is larger than the sum of its proper divisors (741763).

312104561 is an equidigital number, since it uses as much as digits as its factorization.

312104561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741762.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 312104561 is about 17666.4812851909. The cubic root of 312104561 is about 678.3180469054.

Adding to 312104561 its reverse (165401213), we get a palindrome (477505774).

The spelling of 312104561 in words is "three hundred twelve million, one hundred four thousand, five hundred sixty-one".