16428961 has 2 divisors, whose sum is σ = 16428962. Its totient is φ = 16428960.

The previous prime is 16428943. The next prime is 16428983. The reversal of 16428961 is 16982461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8761600 + 7667361 = 2960^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 16428961 - 2⁹ = 16428449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16428961.

It is not a weakly prime, because it can be changed into another prime (16428941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8214480 + 8214481.

It is an arithmetic number, because the mean of its divisors is an integer number (8214481).

Almost surely, 2^16428961 is an apocalyptic number.

It is an amenable number.

16428961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16428961 is an equidigital number, since it uses as much as digits as its factorization.

16428961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 16428961 is about 4053.2654736644. The cubic root of 16428961 is about 254.2162840455.

The spelling of 16428961 in words is "sixteen million, four hundred twenty-eight thousand, nine hundred sixty-one".