5691891691 has 2 divisors, whose sum is σ = 5691891692. Its totient is φ = 5691891690.

The previous prime is 5691891661. The next prime is 5691891701. The reversal of 5691891691 is 1961981965.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5691891691 - 2¹³ = 5691883499 is a prime.

It is not a weakly prime, because it can be changed into another prime (5691891631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2845945845 + 2845945846.

It is an arithmetic number, because the mean of its divisors is an integer number (2845945846).

Almost surely, 2^5691891691 is an apocalyptic number.

5691891691 is a deficient number, since it is larger than the sum of its proper divisors (1).

5691891691 is an equidigital number, since it uses as much as digits as its factorization.

5691891691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 55.

The square root of 5691891691 is about 75444.6266542555. The cubic root of 5691891691 is about 1785.4685680991.

The spelling of 5691891691 in words is "five billion, six hundred ninety-one million, eight hundred ninety-one thousand, six hundred ninety-one".