16042981 has 2 divisors, whose sum is σ = 16042982. Its totient is φ = 16042980.

The previous prime is 16042969. The next prime is 16043023. The reversal of 16042981 is 18924061.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11840481 + 4202500 = 3441^2 + 2050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16042981 is a prime.

It is a super-2 number, since 2×16042981² = 514754478732722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16042921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8021490 + 8021491.

It is an arithmetic number, because the mean of its divisors is an integer number (8021491).

Almost surely, 2^16042981 is an apocalyptic number.

It is an amenable number.

16042981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16042981 is an equidigital number, since it uses as much as digits as its factorization.

16042981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 16042981 is about 4005.3690217007. The cubic root of 16042981 is about 252.2096443480.

The spelling of 16042981 in words is "sixteen million, forty-two thousand, nine hundred eighty-one".