861151285 has 4 divisors (see below), whose sum is σ = 1033381548. Its totient is φ = 688921024.

The previous prime is 861151267. The next prime is 861151297. The reversal of 861151285 is 582151168.

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

It can be written as a sum of positive squares in 2 ways, for example, as 138509361 + 722641924 = 11769^2 + 26882^2 .

It is a cyclic number.

It is not a de Polignac number, because 861151285 - 2¹³ = 861143093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86115124 + ... + 86115133.

It is an arithmetic number, because the mean of its divisors is an integer number (258345387).

Almost surely, 2^861151285 is an apocalyptic number.

It is an amenable number.

861151285 is a deficient number, since it is larger than the sum of its proper divisors (172230263).

861151285 is a wasteful number, since it uses less digits than its factorization.

861151285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172230262.

The product of its digits is 19200, while the sum is 37.

The square root of 861151285 is about 29345.3792785167. The cubic root of 861151285 is about 951.3927070526.

The spelling of 861151285 in words is "eight hundred sixty-one million, one hundred fifty-one thousand, two hundred eighty-five".