16226981 has 8 divisors (see below), whose sum is σ = 16800000. Its totient is φ = 15657120.

The previous prime is 16226927. The next prime is 16227011. The reversal of 16226981 is 18962261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16226981 is a prime.

It is a super-2 number, since 2×16226981² = 526629824748722, 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 (16226081) 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, 14945 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (2100000).

Almost surely, 2^16226981 is an apocalyptic number.

It is an amenable number.

16226981 is a deficient number, since it is larger than the sum of its proper divisors (573019).

16226981 is a wasteful number, since it uses less digits than its factorization.

16226981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579.

The product of its digits is 10368, while the sum is 35.

The square root of 16226981 is about 4028.2727067566. The cubic root of 16226981 is about 253.1701948666.

The spelling of 16226981 in words is "sixteen million, two hundred twenty-six thousand, nine hundred eighty-one".