869653553 has 2 divisors, whose sum is σ = 869653554. Its totient is φ = 869653552.

The previous prime is 869653523. The next prime is 869653559. The reversal of 869653553 is 355356968.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435014449 + 434639104 = 20857^2 + 20848^2 .

It is a cyclic number.

It is not a de Polignac number, because 869653553 - 2¹⁰ = 869652529 is a prime.

It is not a weakly prime, because it can be changed into another prime (869653559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434826776 + 434826777.

It is an arithmetic number, because the mean of its divisors is an integer number (434826777).

Almost surely, 2^869653553 is an apocalyptic number.

It is an amenable number.

869653553 is a deficient number, since it is larger than the sum of its proper divisors (1).

869653553 is an equidigital number, since it uses as much as digits as its factorization.

869653553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916000, while the sum is 50.

The square root of 869653553 is about 29489.8889960610. Note that the first 3 decimals coincide. The cubic root of 869653553 is about 954.5135367718.

The spelling of 869653553 in words is "eight hundred sixty-nine million, six hundred fifty-three thousand, five hundred fifty-three".