5681211491 has 2 divisors, whose sum is σ = 5681211492. Its totient is φ = 5681211490.

The previous prime is 5681211463. The next prime is 5681211517. The reversal of 5681211491 is 1941121865.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5681211491 - 2²² = 5677017187 is a prime.

It is not a weakly prime, because it can be changed into another prime (5681211461) 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 as a sum of consecutive naturals, namely, 2840605745 + 2840605746.

It is an arithmetic number, because the mean of its divisors is an integer number (2840605746).

Almost surely, 2^5681211491 is an apocalyptic number.

5681211491 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681211491 is an equidigital number, since it uses as much as digits as its factorization.

5681211491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 38.

The square root of 5681211491 is about 75373.8117053927. The cubic root of 5681211491 is about 1784.3511246703.

The spelling of 5681211491 in words is "five billion, six hundred eighty-one million, two hundred eleven thousand, four hundred ninety-one".