16861573 has 2 divisors, whose sum is σ = 16861574. Its totient is φ = 16861572.

The previous prime is 16861571. The next prime is 16861583. The reversal of 16861573 is 37516861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13823524 + 3038049 = 3718^2 + 1743^2 .

It is a cyclic number.

It is not a de Polignac number, because 16861573 - 2¹ = 16861571 is a prime.

Together with 16861571, it forms a pair of twin primes.

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, 8430786 + 8430787.

It is an arithmetic number, because the mean of its divisors is an integer number (8430787).

Almost surely, 2^16861573 is an apocalyptic number.

It is an amenable number.

16861573 is a deficient number, since it is larger than the sum of its proper divisors (1).

16861573 is an equidigital number, since it uses as much as digits as its factorization.

16861573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 16861573 is about 4106.2845736748. The cubic root of 16861573 is about 256.4283447741.

The spelling of 16861573 in words is "sixteen million, eight hundred sixty-one thousand, five hundred seventy-three".