5991227681 has 2 divisors, whose sum is σ = 5991227682. Its totient is φ = 5991227680.

The previous prime is 5991227651. The next prime is 5991227689. The reversal of 5991227681 is 1867221995.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5401515025 + 589712656 = 73495^2 + 24284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5991227681 is a prime.

It is a super-2 number, since 2×5991227681² = 71789618251161275522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5991227689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2995613840 + 2995613841.

It is an arithmetic number, because the mean of its divisors is an integer number (2995613841).

Almost surely, 2^5991227681 is an apocalyptic number.

It is an amenable number.

5991227681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5991227681 is an equidigital number, since it uses as much as digits as its factorization.

5991227681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 5991227681 is about 77403.0211361288. The cubic root of 5991227681 is about 1816.2345852560.

The spelling of 5991227681 in words is "five billion, nine hundred ninety-one million, two hundred twenty-seven thousand, six hundred eighty-one".