16856261 has 2 divisors, whose sum is σ = 16856262. Its totient is φ = 16856260.

The previous prime is 16856239. The next prime is 16856269. The reversal of 16856261 is 16265861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16080100 + 776161 = 4010^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 16856261 - 2¹⁸ = 16594117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16856269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8428130 + 8428131.

It is an arithmetic number, because the mean of its divisors is an integer number (8428131).

Almost surely, 2^16856261 is an apocalyptic number.

It is an amenable number.

16856261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16856261 is an equidigital number, since it uses as much as digits as its factorization.

16856261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 16856261 is about 4105.6377092968. The cubic root of 16856261 is about 256.4014139052.

The spelling of 16856261 in words is "sixteen million, eight hundred fifty-six thousand, two hundred sixty-one".