691222 has 16 divisors (see below), whose sum is σ = 1199520. Its totient is φ = 292608.

The previous prime is 691199. The next prime is 691231. The reversal of 691222 is 222196.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 691193 and 691202.

It is a congruent number.

It is an unprimeable number.

691222 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1104 + ... + 1612.

It is an arithmetic number, because the mean of its divisors is an integer number (74970).

2⁶⁹¹²²² is an apocalyptic number.

691222 is the 679-th pentagonal number.

691222 is a deficient number, since it is larger than the sum of its proper divisors (508298).

691222 is a wasteful number, since it uses less digits than its factorization.

691222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615.

The product of its digits is 432, while the sum is 22.

The square root of 691222 is about 831.3976184715. The cubic root of 691222 is about 88.4176940210.

The spelling of 691222 in words is "six hundred ninety-one thousand, two hundred twenty-two".