5591216401 has 4 divisors (see below), whose sum is σ = 5599475892. Its totient is φ = 5582956912.

The previous prime is 5591216387. The next prime is 5591216459. The reversal of 5591216401 is 1046121955.

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 3573050625 + 2018165776 = 59775^2 + 44924^2 .

It is a cyclic number.

It is not a de Polignac number, because 5591216401 - 2²³ = 5582827793 is a prime.

It is a super-2 number, since 2×5591216401² = 62523401685622785602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5591216461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4128730 + ... + 4130083.

It is an arithmetic number, because the mean of its divisors is an integer number (1399868973).

Almost surely, 2^5591216401 is an apocalyptic number.

It is an amenable number.

5591216401 is a deficient number, since it is larger than the sum of its proper divisors (8259491).

5591216401 is an equidigital number, since it uses as much as digits as its factorization.

5591216401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8259490.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 5591216401 is about 74774.4368149971. The cubic root of 5591216401 is about 1774.8790661243.

The spelling of 5591216401 in words is "five billion, five hundred ninety-one million, two hundred sixteen thousand, four hundred one".