868210551 has 24 divisors (see below), whose sum is σ = 1353236976. Its totient is φ = 533220480.

The previous prime is 868210517. The next prime is 868210561. The reversal of 868210551 is 155012868.

868210551 is a `hidden beast` number, since 86 + 8 + 21 + 0 + 551 = 666.

It is not a de Polignac number, because 868210551 - 2⁷ = 868210423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868210561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53836 + ... + 68078.

It is an arithmetic number, because the mean of its divisors is an integer number (56384874).

Almost surely, 2^868210551 is an apocalyptic number.

868210551 is a deficient number, since it is larger than the sum of its proper divisors (485026425).

868210551 is a wasteful number, since it uses less digits than its factorization.

868210551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14783 (or 14780 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 868210551 is about 29465.4127919498. The cubic root of 868210551 is about 953.9853082399.

The spelling of 868210551 in words is "eight hundred sixty-eight million, two hundred ten thousand, five hundred fifty-one".