852619721 has 2 divisors, whose sum is σ = 852619722. Its totient is φ = 852619720.

The previous prime is 852619697. The next prime is 852619727. The reversal of 852619721 is 127916258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520068025 + 332551696 = 22805^2 + 18236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-852619721 is a prime.

It is not a weakly prime, because it can be changed into another prime (852619727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426309860 + 426309861.

It is an arithmetic number, because the mean of its divisors is an integer number (426309861).

Almost surely, 2^852619721 is an apocalyptic number.

It is an amenable number.

852619721 is a deficient number, since it is larger than the sum of its proper divisors (1).

852619721 is an equidigital number, since it uses as much as digits as its factorization.

852619721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 852619721 is about 29199.6527547846. The cubic root of 852619721 is about 948.2404071550.

The spelling of 852619721 in words is "eight hundred fifty-two million, six hundred nineteen thousand, seven hundred twenty-one".