1312075561 has 4 divisors (see below), whose sum is σ = 1312220800. Its totient is φ = 1311930324.

The previous prime is 1312075559. The next prime is 1312075591. The reversal of 1312075561 is 1655702131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1312075561 - 2¹ = 1312075559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312075511) 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, 58101 + ... + 77458.

It is an arithmetic number, because the mean of its divisors is an integer number (328055200).

Almost surely, 2^1312075561 is an apocalyptic number.

It is an amenable number.

1312075561 is a deficient number, since it is larger than the sum of its proper divisors (145239).

1312075561 is an equidigital number, since it uses as much as digits as its factorization.

1312075561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145238.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 1312075561 is about 36222.5835771001. The cubic root of 1312075561 is about 1094.7617507414.

Adding to 1312075561 its reverse (1655702131), we get a palindrome (2967777692).

The spelling of 1312075561 in words is "one billion, three hundred twelve million, seventy-five thousand, five hundred sixty-one".