852001721 has 2 divisors, whose sum is σ = 852001722. Its totient is φ = 852001720.

The previous prime is 852001687. The next prime is 852001739. The reversal of 852001721 is 127100258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803155600 + 48846121 = 28340^2 + 6989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-852001721 is a prime.

It is not a weakly prime, because it can be changed into another prime (852001741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426000860 + 426000861.

It is an arithmetic number, because the mean of its divisors is an integer number (426000861).

Almost surely, 2^852001721 is an apocalyptic number.

It is an amenable number.

852001721 is a deficient number, since it is larger than the sum of its proper divisors (1).

852001721 is an equidigital number, since it uses as much as digits as its factorization.

852001721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 852001721 is about 29189.0685188822. The cubic root of 852001721 is about 948.0112490283.

Adding to 852001721 its reverse (127100258), we get a palindrome (979101979).

The spelling of 852001721 in words is "eight hundred fifty-two million, one thousand, seven hundred twenty-one".