661219 has 8 divisors (see below), whose sum is σ = 749840. Its totient is φ = 578016.

The previous prime is 661217. The next prime is 661231. The reversal of 661219 is 912166.

661219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 661219 - 2¹ = 661217 is a prime.

It is a super-2 number, since 2×661219² = 874421131922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661193 and 661202.

It is not an unprimeable number, because it can be changed into a prime (661217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1092 + ... + 1585.

It is an arithmetic number, because the mean of its divisors is an integer number (93730).

2⁶⁶¹²¹⁹ is an apocalyptic number.

661219 is a deficient number, since it is larger than the sum of its proper divisors (88621).

661219 is a wasteful number, since it uses less digits than its factorization.

661219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709.

The product of its digits is 648, while the sum is 25.

The square root of 661219 is about 813.1537370018. The cubic root of 661219 is about 87.1194466235.

The spelling of 661219 in words is "six hundred sixty-one thousand, two hundred nineteen".