1345552561 has 4 divisors (see below), whose sum is σ = 1347123492. Its totient is φ = 1343981632.

The previous prime is 1345552529. The next prime is 1345552577. The reversal of 1345552561 is 1652555431.

It is a happy number.

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 1318053025 + 27499536 = 36305^2 + 5244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345552561 - 2⁵ = 1345552529 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 1345552561.

It is not an unprimeable number, because it can be changed into a prime (1345552661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784180 + ... + 785893.

It is an arithmetic number, because the mean of its divisors is an integer number (336780873).

Almost surely, 2^1345552561 is an apocalyptic number.

It is an amenable number.

1345552561 is a deficient number, since it is larger than the sum of its proper divisors (1570931).

1345552561 is an equidigital number, since it uses as much as digits as its factorization.

1345552561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570930.

The product of its digits is 90000, while the sum is 37.

The square root of 1345552561 is about 36681.7742346250. The cubic root of 1345552561 is about 1103.9944473155.

The spelling of 1345552561 in words is "one billion, three hundred forty-five million, five hundred fifty-two thousand, five hundred sixty-one".