16765121 has 2 divisors, whose sum is σ = 16765122. Its totient is φ = 16765120.

The previous prime is 16765117. The next prime is 16765129. The reversal of 16765121 is 12156761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 5340721 = 3380^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 16765121 - 2² = 16765117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16765129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382560 + 8382561.

It is an arithmetic number, because the mean of its divisors is an integer number (8382561).

Almost surely, 2^16765121 is an apocalyptic number.

It is an amenable number.

16765121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16765121 is an equidigital number, since it uses as much as digits as its factorization.

16765121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 16765121 is about 4094.5232933762. The cubic root of 16765121 is about 255.9384668596.

The spelling of 16765121 in words is "sixteen million, seven hundred sixty-five thousand, one hundred twenty-one".