16255781 has 2 divisors, whose sum is σ = 16255782. Its totient is φ = 16255780.

The previous prime is 16255703. The next prime is 16255787. The reversal of 16255781 is 18755261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11282881 + 4972900 = 3359^2 + 2230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16255781 is a prime.

It is a super-2 number, since 2×16255781² = 528500831839922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16255787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8127890 + 8127891.

It is an arithmetic number, because the mean of its divisors is an integer number (8127891).

Almost surely, 2^16255781 is an apocalyptic number.

It is an amenable number.

16255781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16255781 is an equidigital number, since it uses as much as digits as its factorization.

16255781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 35.

The square root of 16255781 is about 4031.8458551884. The cubic root of 16255781 is about 253.3198836735.

The spelling of 16255781 in words is "sixteen million, two hundred fifty-five thousand, seven hundred eighty-one".