5721691 has 2 divisors, whose sum is σ = 5721692. Its totient is φ = 5721690.

The previous prime is 5721689. The next prime is 5721697. The reversal of 5721691 is 1961275.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5721691 - 2¹ = 5721689 is a prime.

Together with 5721689, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5721697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2860845 + 2860846.

It is an arithmetic number, because the mean of its divisors is an integer number (2860846).

Almost surely, 2^5721691 is an apocalyptic number.

5721691 is a deficient number, since it is larger than the sum of its proper divisors (1).

5721691 is an equidigital number, since it uses as much as digits as its factorization.

5721691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 5721691 is about 2392.0056438061. The cubic root of 5721691 is about 178.8579024783.

The spelling of 5721691 in words is "five million, seven hundred twenty-one thousand, six hundred ninety-one".