16254781 has 2 divisors, whose sum is σ = 16254782. Its totient is φ = 16254780.

The previous prime is 16254773. The next prime is 16254787. The reversal of 16254781 is 18745261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15729156 + 525625 = 3966^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 16254781 - 2³ = 16254773 is a prime.

It is a super-4 number, since 4×16254781⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16254787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8127390 + 8127391.

It is an arithmetic number, because the mean of its divisors is an integer number (8127391).

Almost surely, 2^16254781 is an apocalyptic number.

It is an amenable number.

16254781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16254781 is an equidigital number, since it uses as much as digits as its factorization.

16254781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 16254781 is about 4031.7218406036. The cubic root of 16254781 is about 253.3146891096.

The spelling of 16254781 in words is "sixteen million, two hundred fifty-four thousand, seven hundred eighty-one".