16721461 has 2 divisors, whose sum is σ = 16721462. Its totient is φ = 16721460.

The previous prime is 16721449. The next prime is 16721473. The reversal of 16721461 is 16412761.

It is a balanced prime because it is at equal distance from previous prime (16721449) and next prime (16721473).

It can be written as a sum of positive squares in only one way, i.e., 14676561 + 2044900 = 3831^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 16721461 - 2⁷ = 16721333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16751461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360730 + 8360731.

It is an arithmetic number, because the mean of its divisors is an integer number (8360731).

Almost surely, 2^16721461 is an apocalyptic number.

It is an amenable number.

16721461 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721461 is an equidigital number, since it uses as much as digits as its factorization.

16721461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 16721461 is about 4089.1883057644. The cubic root of 16721461 is about 255.7161006825.

The spelling of 16721461 in words is "sixteen million, seven hundred twenty-one thousand, four hundred sixty-one".