16991022 has 16 divisors (see below), whose sum is σ = 34180560. Its totient is φ = 5630592.

The previous prime is 16991021. The next prime is 16991027. The reversal of 16991022 is 22019961.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16991021) 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, 7147 + ... + 9222.

It is an arithmetic number, because the mean of its divisors is an integer number (2136285).

Almost surely, 2^16991022 is an apocalyptic number.

16991022 is an abundant number, since it is smaller than the sum of its proper divisors (17189538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16991022 is a wasteful number, since it uses less digits than its factorization.

16991022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16547.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 16991022 is about 4122.0167394129. The cubic root of 16991022 is about 257.0828864557.

The spelling of 16991022 in words is "sixteen million, nine hundred ninety-one thousand, twenty-two".