861031418 has 8 divisors (see below), whose sum is σ = 1390896948. Its totient is φ = 397399104.

The previous prime is 861031397. The next prime is 861031499. The reversal of 861031418 is 814130168.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 827310169 + 33721249 = 28763^2 + 5807^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 16558271 + ... + 16558322.

Almost surely, 2^861031418 is an apocalyptic number.

861031418 is a deficient number, since it is larger than the sum of its proper divisors (529865530).

861031418 is a wasteful number, since it uses less digits than its factorization.

861031418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33116608.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 861031418 is about 29343.3368586465. The cubic root of 861031418 is about 951.3485623193.

The spelling of 861031418 in words is "eight hundred sixty-one million, thirty-one thousand, four hundred eighteen".