681219 has 24 divisors (see below), whose sum is σ = 1228032. Its totient is φ = 353520.

The previous prime is 681179. The next prime is 681221. The reversal of 681219 is 912186.

681219 = T₂₁₁ + T₂₁₂ + ... + T₂₃₇.

It is not a de Polignac number, because 681219 - 2⁷ = 681091 is a prime.

It is a super-2 number, since 2×681219² = 928118651922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681192 and 681201.

It is not an unprimeable number, because it can be changed into a prime (681229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202 + ... + 1184.

It is an arithmetic number, because the mean of its divisors is an integer number (51168).

2⁶⁸¹²¹⁹ is an apocalyptic number.

681219 is a deficient number, since it is larger than the sum of its proper divisors (546813).

681219 is a wasteful number, since it uses less digits than its factorization.

681219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 1004 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 681219 is about 825.3599214888. The cubic root of 681219 is about 87.9891085005.

It can be divided in two parts, 68121 and 9, that multiplied together give a square (613089 = 783²).

The spelling of 681219 in words is "six hundred eighty-one thousand, two hundred nineteen".