16861541 has 2 divisors, whose sum is σ = 16861542. Its totient is φ = 16861540.

The previous prime is 16861519. The next prime is 16861567. The reversal of 16861541 is 14516861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14984641 + 1876900 = 3871^2 + 1370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16861541 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16861498 and 16861507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16861571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8430770 + 8430771.

It is an arithmetic number, because the mean of its divisors is an integer number (8430771).

Almost surely, 2^16861541 is an apocalyptic number.

It is an amenable number.

16861541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16861541 is an equidigital number, since it uses as much as digits as its factorization.

16861541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The square root of 16861541 is about 4106.2806772066. The cubic root of 16861541 is about 256.4281825569.

The spelling of 16861541 in words is "sixteen million, eight hundred sixty-one thousand, five hundred forty-one".