853231661 has 2 divisors, whose sum is σ = 853231662. Its totient is φ = 853231660.

The previous prime is 853231619. The next prime is 853231681. The reversal of 853231661 is 166132358.

853231661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 485320900 + 367910761 = 22030^2 + 19181^2 .

It is a cyclic number.

It is not a de Polignac number, because 853231661 - 2¹⁴ = 853215277 is a prime.

It is a super-3 number, since 3×853231661³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (853231601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426615830 + 426615831.

It is an arithmetic number, because the mean of its divisors is an integer number (426615831).

Almost surely, 2^853231661 is an apocalyptic number.

It is an amenable number.

853231661 is a deficient number, since it is larger than the sum of its proper divisors (1).

853231661 is an equidigital number, since it uses as much as digits as its factorization.

853231661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 853231661 is about 29210.1294245678. The cubic root of 853231661 is about 948.4672091135.

The spelling of 853231661 in words is "eight hundred fifty-three million, two hundred thirty-one thousand, six hundred sixty-one".