869663897 has 2 divisors, whose sum is σ = 869663898. Its totient is φ = 869663896.

The previous prime is 869663891. The next prime is 869663939. The reversal of 869663897 is 798366968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778633216 + 91030681 = 27904^2 + 9541^2 .

It is a cyclic number.

It is not a de Polignac number, because 869663897 - 2¹⁰ = 869662873 is a prime.

It is not a weakly prime, because it can be changed into another prime (869663891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434831948 + 434831949.

It is an arithmetic number, because the mean of its divisors is an integer number (434831949).

Almost surely, 2^869663897 is an apocalyptic number.

It is an amenable number.

869663897 is a deficient number, since it is larger than the sum of its proper divisors (1).

869663897 is an equidigital number, since it uses as much as digits as its factorization.

869663897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 62.

The square root of 869663897 is about 29490.0643776849. The cubic root of 869663897 is about 954.5173212095.

The spelling of 869663897 in words is "eight hundred sixty-nine million, six hundred sixty-three thousand, eight hundred ninety-seven".