860255551 has 4 divisors (see below), whose sum is σ = 861619504. Its totient is φ = 858891600.

The previous prime is 860255531. The next prime is 860255567. The reversal of 860255551 is 155552068.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 860255551 - 2⁷ = 860255423 is a prime.

It is a super-2 number, since 2×860255551² = 1480079226052627202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 860255551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (860255531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681030 + ... + 682291.

It is an arithmetic number, because the mean of its divisors is an integer number (215404876).

Almost surely, 2^860255551 is an apocalyptic number.

860255551 is a deficient number, since it is larger than the sum of its proper divisors (1363953).

860255551 is a wasteful number, since it uses less digits than its factorization.

860255551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363952.

The product of its (nonzero) digits is 60000, while the sum is 37.

The square root of 860255551 is about 29330.1133819834. The cubic root of 860255551 is about 951.0627261486.

The spelling of 860255551 in words is "eight hundred sixty million, two hundred fifty-five thousand, five hundred fifty-one".