1301351561 has 4 divisors (see below), whose sum is σ = 1302753300. Its totient is φ = 1299949824.

The previous prime is 1301351551. The next prime is 1301351563. The reversal of 1301351561 is 1651531031.

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 559606336 + 741745225 = 23656^2 + 27235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301351561 - 2⁶ = 1301351497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1301351561.

It is not an unprimeable number, because it can be changed into a prime (1301351563) 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, 699476 + ... + 701333.

It is an arithmetic number, because the mean of its divisors is an integer number (325688325).

Almost surely, 2^1301351561 is an apocalyptic number.

It is an amenable number.

1301351561 is a deficient number, since it is larger than the sum of its proper divisors (1401739).

1301351561 is an equidigital number, since it uses as much as digits as its factorization.

1301351561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401738.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 1301351561 is about 36074.2506644282. The cubic root of 1301351561 is about 1091.7709787419.

Adding to 1301351561 its reverse (1651531031), we get a palindrome (2952882592).

The spelling of 1301351561 in words is "one billion, three hundred one million, three hundred fifty-one thousand, five hundred sixty-one".