5621261611 has 4 divisors (see below), whose sum is σ = 6424298992. Its totient is φ = 4818224232.

The previous prime is 5621261579. The next prime is 5621261623. The reversal of 5621261611 is 1161621265.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5621261611 - 2⁵ = 5621261579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5621261671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401518680 + ... + 401518693.

It is an arithmetic number, because the mean of its divisors is an integer number (1606074748).

Almost surely, 2^5621261611 is an apocalyptic number.

5621261611 is a deficient number, since it is larger than the sum of its proper divisors (803037381).

5621261611 is an equidigital number, since it uses as much as digits as its factorization.

5621261611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803037380.

The product of its digits is 4320, while the sum is 31.

The square root of 5621261611 is about 74975.0732643857. The cubic root of 5621261611 is about 1778.0525782408.

Adding to 5621261611 its reverse (1161621265), we get a palindrome (6782882876).

The spelling of 5621261611 in words is "five billion, six hundred twenty-one million, two hundred sixty-one thousand, six hundred eleven".