16776401 has 2 divisors, whose sum is σ = 16776402. Its totient is φ = 16776400.

The previous prime is 16776391. The next prime is 16776451. The reversal of 16776401 is 10467761.

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., 9891025 + 6885376 = 3145^2 + 2624^2 .

It is an emirp because it is prime and its reverse (10467761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16776401 - 2⁶ = 16776337 is a prime.

It is a nialpdrome in base 8.

It is not a weakly prime, because it can be changed into another prime (16776451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8388200 + 8388201.

It is an arithmetic number, because the mean of its divisors is an integer number (8388201).

Almost surely, 2^16776401 is an apocalyptic number.

It is an amenable number.

16776401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16776401 is an equidigital number, since it uses as much as digits as its factorization.

16776401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 16776401 is about 4095.9005114871. The cubic root of 16776401 is about 255.9958546285.

The spelling of 16776401 in words is "sixteen million, seven hundred seventy-six thousand, four hundred one".