681181219 has 2 divisors, whose sum is σ = 681181220. Its totient is φ = 681181218.

The previous prime is 681181183. The next prime is 681181223. The reversal of 681181219 is 912181186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681181219 - 2²¹ = 679084067 is a prime.

It is a super-2 number, since 2×681181219² = 928015706236651922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681181229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340590609 + 340590610.

It is an arithmetic number, because the mean of its divisors is an integer number (340590610).

Almost surely, 2^681181219 is an apocalyptic number.

681181219 is a deficient number, since it is larger than the sum of its proper divisors (1).

681181219 is an equidigital number, since it uses as much as digits as its factorization.

681181219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 37.

The square root of 681181219 is about 26099.4486340229. The cubic root of 681181219 is about 879.8748181955.

The spelling of 681181219 in words is "six hundred eighty-one million, one hundred eighty-one thousand, two hundred nineteen".