869487121 has 2 divisors, whose sum is σ = 869487122. Its totient is φ = 869487120.

The previous prime is 869487109. The next prime is 869487127. The reversal of 869487121 is 121784968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435348225 + 434138896 = 20865^2 + 20836^2 .

It is a cyclic number.

It is not a de Polignac number, because 869487121 - 2⁵ = 869487089 is a prime.

It is not a weakly prime, because it can be changed into another prime (869487127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434743560 + 434743561.

It is an arithmetic number, because the mean of its divisors is an integer number (434743561).

Almost surely, 2^869487121 is an apocalyptic number.

It is an amenable number.

869487121 is a deficient number, since it is larger than the sum of its proper divisors (1).

869487121 is an equidigital number, since it uses as much as digits as its factorization.

869487121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 46.

The square root of 869487121 is about 29487.0670125057. The cubic root of 869487121 is about 954.4526421272.

The spelling of 869487121 in words is "eight hundred sixty-nine million, four hundred eighty-seven thousand, one hundred twenty-one".