16122981 has 8 divisors (see below), whose sum is σ = 24568384. Its totient is φ = 9213120.

The previous prime is 16122949. The next prime is 16122983. The reversal of 16122981 is 18922161.

It is a happy number.

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

It is not a de Polignac number, because 16122981 - 2⁵ = 16122949 is a prime.

It is a super-2 number, since 2×16122981² = 519901032652722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16122983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383860 + ... + 383901.

It is an arithmetic number, because the mean of its divisors is an integer number (3071048).

Almost surely, 2^16122981 is an apocalyptic number.

It is an amenable number.

16122981 is a deficient number, since it is larger than the sum of its proper divisors (8445403).

16122981 is an equidigital number, since it uses as much as digits as its factorization.

16122981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767771.

The product of its digits is 1728, while the sum is 30.

The square root of 16122981 is about 4015.3431982833. The cubic root of 16122981 is about 252.6281726811.

The spelling of 16122981 in words is "sixteen million, one hundred twenty-two thousand, nine hundred eighty-one".