6541121579 has 2 divisors, whose sum is σ = 6541121580. Its totient is φ = 6541121578.

The previous prime is 6541121563. The next prime is 6541121633. The reversal of 6541121579 is 9751211456.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6541121579 - 2⁴ = 6541121563 is a prime.

It is a super-2 number, since 2×6541121579² = 85572543022518906482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6541129579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270560789 + 3270560790.

It is an arithmetic number, because the mean of its divisors is an integer number (3270560790).

Almost surely, 2^6541121579 is an apocalyptic number.

6541121579 is a deficient number, since it is larger than the sum of its proper divisors (1).

6541121579 is an equidigital number, since it uses as much as digits as its factorization.

6541121579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 6541121579 is about 80877.2006130281. The cubic root of 6541121579 is about 1870.1828659094.

The spelling of 6541121579 in words is "six billion, five hundred forty-one million, one hundred twenty-one thousand, five hundred seventy-nine".