991622 has 8 divisors (see below), whose sum is σ = 1552176. Its totient is φ = 474232.

The previous prime is 991621. The next prime is 991633. The reversal of 991622 is 226199.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991622.

It is not an unprimeable number, because it can be changed into a prime (991621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10733 + ... + 10824.

It is an arithmetic number, because the mean of its divisors is an integer number (194022).

2⁹⁹¹⁶²² is an apocalyptic number.

991622 is a deficient number, since it is larger than the sum of its proper divisors (560554).

991622 is a wasteful number, since it uses less digits than its factorization.

991622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21582.

The product of its digits is 1944, while the sum is 29.

The square root of 991622 is about 995.8021891922. The cubic root of 991622 is about 99.7199497842.

The spelling of 991622 in words is "nine hundred ninety-one thousand, six hundred twenty-two".