17661481 has 2 divisors, whose sum is σ = 17661482. Its totient is φ = 17661480.

The previous prime is 17661461. The next prime is 17661499. The reversal of 17661481 is 18416671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15085456 + 2576025 = 3884^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 17661481 - 2⁷ = 17661353 is a prime.

It is a super-2 number, since 2×17661481² = 623855822226722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17661461) 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, 8830740 + 8830741.

It is an arithmetic number, because the mean of its divisors is an integer number (8830741).

Almost surely, 2^17661481 is an apocalyptic number.

It is an amenable number.

17661481 is a deficient number, since it is larger than the sum of its proper divisors (1).

17661481 is an equidigital number, since it uses as much as digits as its factorization.

17661481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 17661481 is about 4202.5564838560. The cubic root of 17661481 is about 260.4208224560.

The spelling of 17661481 in words is "seventeen million, six hundred sixty-one thousand, four hundred eighty-one".