806974525921 has 2 divisors, whose sum is σ = 806974525922. Its totient is φ = 806974525920.

The previous prime is 806974525909. The next prime is 806974526003. The reversal of 806974525921 is 129525479608.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 746772505600 + 60202020321 = 864160^2 + 245361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806974525921 is a prime.

It is not a weakly prime, because it can be changed into another prime (806974523921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403487262960 + 403487262961.

It is an arithmetic number, because the mean of its divisors is an integer number (403487262961).

Almost surely, 2^806974525921 is an apocalyptic number.

It is an amenable number.

806974525921 is a deficient number, since it is larger than the sum of its proper divisors (1).

806974525921 is an equidigital number, since it uses as much as digits as its factorization.

806974525921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 806974525921 in words is "eight hundred six billion, nine hundred seventy-four million, five hundred twenty-five thousand, nine hundred twenty-one".