861200887 has 4 divisors (see below), whose sum is σ = 862913520. Its totient is φ = 859488256.

The previous prime is 861200839. The next prime is 861200903. The reversal of 861200887 is 788002168.

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 861200887 - 2¹¹ = 861198839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861200827) 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, 855562 + ... + 856567.

It is an arithmetic number, because the mean of its divisors is an integer number (215728380).

Almost surely, 2^861200887 is an apocalyptic number.

861200887 is a deficient number, since it is larger than the sum of its proper divisors (1712633).

861200887 is a wasteful number, since it uses less digits than its factorization.

861200887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712632.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 861200887 is about 29346.2244079200. The cubic root of 861200887 is about 951.4109733262.

The spelling of 861200887 in words is "eight hundred sixty-one million, two hundred thousand, eight hundred eighty-seven".