16278461 has 2 divisors, whose sum is σ = 16278462. Its totient is φ = 16278460.

The previous prime is 16278433. The next prime is 16278463. The reversal of 16278461 is 16487261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13734436 + 2544025 = 3706^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 16278461 - 2²² = 12084157 is a prime.

Together with 16278463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16278463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8139230 + 8139231.

It is an arithmetic number, because the mean of its divisors is an integer number (8139231).

Almost surely, 2^16278461 is an apocalyptic number.

It is an amenable number.

16278461 is a deficient number, since it is larger than the sum of its proper divisors (1).

16278461 is an equidigital number, since it uses as much as digits as its factorization.

16278461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 16278461 is about 4034.6574823645. The cubic root of 16278461 is about 253.4376392193.

The spelling of 16278461 in words is "sixteen million, two hundred seventy-eight thousand, four hundred sixty-one".