16501081 has 2 divisors, whose sum is σ = 16501082. Its totient is φ = 16501080.

The previous prime is 16501031. The next prime is 16501091. The reversal of 16501081 is 18010561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16475481 + 25600 = 4059^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 16501081 - 2¹¹ = 16499033 is a prime.

It is a super-2 number, since 2×16501081² = 544571348337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16501031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250540 + 8250541.

It is an arithmetic number, because the mean of its divisors is an integer number (8250541).

Almost surely, 2^16501081 is an apocalyptic number.

It is an amenable number.

16501081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16501081 is an equidigital number, since it uses as much as digits as its factorization.

16501081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 16501081 is about 4062.1522620404. The cubic root of 16501081 is about 254.5877280247.

The spelling of 16501081 in words is "sixteen million, five hundred one thousand, eighty-one".