869440261 has 2 divisors, whose sum is σ = 869440262. Its totient is φ = 869440260.

The previous prime is 869440183. The next prime is 869440277. The reversal of 869440261 is 162044968.

869440261 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., 811908036 + 57532225 = 28494^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 869440261 - 2²⁷ = 735222533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869440861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434720130 + 434720131.

It is an arithmetic number, because the mean of its divisors is an integer number (434720131).

Almost surely, 2^869440261 is an apocalyptic number.

It is an amenable number.

869440261 is a deficient number, since it is larger than the sum of its proper divisors (1).

869440261 is an equidigital number, since it uses as much as digits as its factorization.

869440261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 869440261 is about 29486.2724161600. The cubic root of 869440261 is about 954.4354954464.

The spelling of 869440261 in words is "eight hundred sixty-nine million, four hundred forty thousand, two hundred sixty-one".