861365481 has 4 divisors (see below), whose sum is σ = 1148487312. Its totient is φ = 574243652.

The previous prime is 861365447. The next prime is 861365489. The reversal of 861365481 is 184563168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861365481 - 2⁷ = 861365353 is a prime.

It is a super-2 number, since 2×861365481² = 1483900983716722722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861365489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143560911 + ... + 143560916.

It is an arithmetic number, because the mean of its divisors is an integer number (287121828).

Almost surely, 2^861365481 is an apocalyptic number.

It is an amenable number.

861365481 is a deficient number, since it is larger than the sum of its proper divisors (287121831).

861365481 is a wasteful number, since it uses less digits than its factorization.

861365481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287121830.

The product of its digits is 138240, while the sum is 42.

The square root of 861365481 is about 29349.0286210634. The cubic root of 861365481 is about 951.4715811607.

The spelling of 861365481 in words is "eight hundred sixty-one million, three hundred sixty-five thousand, four hundred eighty-one".