16049981 has 2 divisors, whose sum is σ = 16049982. Its totient is φ = 16049980.

The previous prime is 16049951. The next prime is 16049987. The reversal of 16049981 is 18994061.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10621081 + 5428900 = 3259^2 + 2330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16049981 is a prime.

It is a super-2 number, since 2×16049981² = 515203780200722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16049987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8024990 + 8024991.

It is an arithmetic number, because the mean of its divisors is an integer number (8024991).

Almost surely, 2^16049981 is an apocalyptic number.

It is an amenable number.

16049981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16049981 is an equidigital number, since it uses as much as digits as its factorization.

16049981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 16049981 is about 4006.2427535036. The cubic root of 16049981 is about 252.2463210478.

The spelling of 16049981 in words is "sixteen million, forty-nine thousand, nine hundred eighty-one".