5641261561 has 4 divisors (see below), whose sum is σ = 6075204772. Its totient is φ = 5207318352.

The previous prime is 5641261531. The next prime is 5641261567. The reversal of 5641261561 is 1651621465.

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 3319949161 + 2321312400 = 57619^2 + 48180^2 .

It is a cyclic number.

It is not a de Polignac number, because 5641261561 - 2⁹ = 5641261049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5641261561.

It is not an unprimeable number, because it can be changed into a prime (5641261567) 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, 216971586 + ... + 216971611.

It is an arithmetic number, because the mean of its divisors is an integer number (1518801193).

Almost surely, 2^5641261561 is an apocalyptic number.

It is an amenable number.

5641261561 is a deficient number, since it is larger than the sum of its proper divisors (433943211).

5641261561 is a wasteful number, since it uses less digits than its factorization.

5641261561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433943210.

The product of its digits is 43200, while the sum is 37.

The square root of 5641261561 is about 75108.3321676097. The cubic root of 5641261561 is about 1780.1588000605.

The spelling of 5641261561 in words is "five billion, six hundred forty-one million, two hundred sixty-one thousand, five hundred sixty-one".