16920289 has 2 divisors, whose sum is σ = 16920290. Its totient is φ = 16920288.

The previous prime is 16920283. The next prime is 16920313. The reversal of 16920289 is 98202961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11444689 + 5475600 = 3383^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 16920289 - 2⁵ = 16920257 is a prime.

It is not a weakly prime, because it can be changed into another prime (16920283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8460144 + 8460145.

It is an arithmetic number, because the mean of its divisors is an integer number (8460145).

Almost surely, 2^16920289 is an apocalyptic number.

It is an amenable number.

16920289 is a deficient number, since it is larger than the sum of its proper divisors (1).

16920289 is an equidigital number, since it uses as much as digits as its factorization.

16920289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 16920289 is about 4113.4278892427. The cubic root of 16920289 is about 256.7256480707.

The spelling of 16920289 in words is "sixteen million, nine hundred twenty thousand, two hundred eighty-nine".