869660917 has 2 divisors, whose sum is σ = 869660918. Its totient is φ = 869660916.

The previous prime is 869660863. The next prime is 869660927. The reversal of 869660917 is 719066968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 720063556 + 149597361 = 26834^2 + 12231^2 .

It is a cyclic number.

It is not a de Polignac number, because 869660917 - 2¹¹ = 869658869 is a prime.

It is a super-2 number, since 2×869660917² = 1512620221114561778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869660927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434830458 + 434830459.

It is an arithmetic number, because the mean of its divisors is an integer number (434830459).

Almost surely, 2^869660917 is an apocalyptic number.

It is an amenable number.

869660917 is a deficient number, since it is larger than the sum of its proper divisors (1).

869660917 is an equidigital number, since it uses as much as digits as its factorization.

869660917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 869660917 is about 29490.0138521500. The cubic root of 869660917 is about 954.5162309550.

The spelling of 869660917 in words is "eight hundred sixty-nine million, six hundred sixty thousand, nine hundred seventeen".