661226 has 8 divisors (see below), whose sum is σ = 997920. Its totient is φ = 328588.

The previous prime is 661217. The next prime is 661231. The reversal of 661226 is 622166.

661226 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (124740).

2⁶⁶¹²²⁶ is an apocalyptic number.

661226 is a deficient number, since it is larger than the sum of its proper divisors (336694).

661226 is a wasteful number, since it uses less digits than its factorization.

661226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028.

The product of its digits is 864, while the sum is 23.

The square root of 661226 is about 813.1580412195. The cubic root of 661226 is about 87.1197540526.

Subtracting from 661226 its reverse (622166), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 661226 in words is "six hundred sixty-one thousand, two hundred twenty-six".