6921889801 has 2 divisors, whose sum is σ = 6921889802. Its totient is φ = 6921889800.

The previous prime is 6921889787. The next prime is 6921889823. The reversal of 6921889801 is 1089881296.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6856668025 + 65221776 = 82805^2 + 8076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6921889801 is a prime.

It is not a weakly prime, because it can be changed into another prime (6921889831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460944900 + 3460944901.

It is an arithmetic number, because the mean of its divisors is an integer number (3460944901).

Almost surely, 2^6921889801 is an apocalyptic number.

It is an amenable number.

6921889801 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921889801 is an equidigital number, since it uses as much as digits as its factorization.

6921889801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 52.

The square root of 6921889801 is about 83197.8954120836. The cubic root of 6921889801 is about 1905.7893410053.

The spelling of 6921889801 in words is "six billion, nine hundred twenty-one million, eight hundred eighty-nine thousand, eight hundred one".