853940861 has 2 divisors, whose sum is σ = 853940862. Its totient is φ = 853940860.

The previous prime is 853940833. The next prime is 853940869. The reversal of 853940861 is 168049358.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 852289636 + 1651225 = 29194^2 + 1285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853940861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (853940869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426970430 + 426970431.

It is an arithmetic number, because the mean of its divisors is an integer number (426970431).

Almost surely, 2^853940861 is an apocalyptic number.

It is an amenable number.

853940861 is a deficient number, since it is larger than the sum of its proper divisors (1).

853940861 is an equidigital number, since it uses as much as digits as its factorization.

853940861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 853940861 is about 29222.2665274273. The cubic root of 853940861 is about 948.7299227052.

The spelling of 853940861 in words is "eight hundred fifty-three million, nine hundred forty thousand, eight hundred sixty-one".