868249553 has 2 divisors, whose sum is σ = 868249554. Its totient is φ = 868249552.

The previous prime is 868249549. The next prime is 868249567. The reversal of 868249553 is 355942868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 841696144 + 26553409 = 29012^2 + 5153^2 .

It is a cyclic number.

It is not a de Polignac number, because 868249553 - 2² = 868249549 is a prime.

It is not a weakly prime, because it can be changed into another prime (868249513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434124776 + 434124777.

It is an arithmetic number, because the mean of its divisors is an integer number (434124777).

Almost surely, 2^868249553 is an apocalyptic number.

It is an amenable number.

868249553 is a deficient number, since it is larger than the sum of its proper divisors (1).

868249553 is an equidigital number, since it uses as much as digits as its factorization.

868249553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 50.

The square root of 868249553 is about 29466.0746113221. The cubic root of 868249553 is about 953.9995930920. Note that the first 3 decimals are identical.

The spelling of 868249553 in words is "eight hundred sixty-eight million, two hundred forty-nine thousand, five hundred fifty-three".