16591061 has 2 divisors, whose sum is σ = 16591062. Its totient is φ = 16591060.

The previous prime is 16591049. The next prime is 16591063. The reversal of 16591061 is 16019561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12567025 + 4024036 = 3545^2 + 2006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16591061 is a prime.

Together with 16591063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16591063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8295530 + 8295531.

It is an arithmetic number, because the mean of its divisors is an integer number (8295531).

Almost surely, 2^16591061 is an apocalyptic number.

It is an amenable number.

16591061 is a deficient number, since it is larger than the sum of its proper divisors (1).

16591061 is an equidigital number, since it uses as much as digits as its factorization.

16591061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 16591061 is about 4073.2126141413. The cubic root of 16591061 is about 255.0496430326.

The spelling of 16591061 in words is "sixteen million, five hundred ninety-one thousand, sixty-one".