869890913 has 2 divisors, whose sum is σ = 869890914. Its totient is φ = 869890912.

The previous prime is 869890897. The next prime is 869890933. The reversal of 869890913 is 319098968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531625249 + 338265664 = 23057^2 + 18392^2 .

It is a cyclic number.

It is not a de Polignac number, because 869890913 - 2⁴ = 869890897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (869890933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434945456 + 434945457.

It is an arithmetic number, because the mean of its divisors is an integer number (434945457).

Almost surely, 2^869890913 is an apocalyptic number.

It is an amenable number.

869890913 is a deficient number, since it is larger than the sum of its proper divisors (1).

869890913 is an equidigital number, since it uses as much as digits as its factorization.

869890913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 869890913 is about 29493.9131516996. The cubic root of 869890913 is about 954.6003693283.

The spelling of 869890913 in words is "eight hundred sixty-nine million, eight hundred ninety thousand, nine hundred thirteen".