5681049991 has 2 divisors, whose sum is σ = 5681049992. Its totient is φ = 5681049990.

The previous prime is 5681049977. The next prime is 5681050061. The reversal of 5681049991 is 1999401865.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5681049991 - 2²³ = 5672661383 is a prime.

It is a super-2 number, since 2×5681049991² = 64548658000482200162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5681049901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840524995 + 2840524996.

It is an arithmetic number, because the mean of its divisors is an integer number (2840524996).

Almost surely, 2^5681049991 is an apocalyptic number.

5681049991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681049991 is an equidigital number, since it uses as much as digits as its factorization.

5681049991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 5681049991 is about 75372.7403707733. The cubic root of 5681049991 is about 1784.3342165726.

The spelling of 5681049991 in words is "five billion, six hundred eighty-one million, forty-nine thousand, nine hundred ninety-one".