861930219 has 4 divisors (see below), whose sum is σ = 1149240296. Its totient is φ = 574620144.

The previous prime is 861930217. The next prime is 861930229. The reversal of 861930219 is 912039168.

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

It is not a de Polignac number, because 861930219 - 2¹ = 861930217 is a prime.

It is a super-2 number, since 2×861930219² = 1485847404850775922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861930217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143655034 + ... + 143655039.

It is an arithmetic number, because the mean of its divisors is an integer number (287310074).

Almost surely, 2^861930219 is an apocalyptic number.

861930219 is a deficient number, since it is larger than the sum of its proper divisors (287310077).

861930219 is a wasteful number, since it uses less digits than its factorization.

861930219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287310076.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 861930219 is about 29358.6481126090. The cubic root of 861930219 is about 951.6794738543.

The spelling of 861930219 in words is "eight hundred sixty-one million, nine hundred thirty thousand, two hundred nineteen".