161641481 has 2 divisors, whose sum is σ = 161641482. Its totient is φ = 161641480.

The previous prime is 161641477. The next prime is 161641499. The reversal of 161641481 is 184146161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149328400 + 12313081 = 12220^2 + 3509^2 .

It is a cyclic number.

It is not a de Polignac number, because 161641481 - 2² = 161641477 is a prime.

It is a super-3 number, since 3×161641481³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161641451) 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, 80820740 + 80820741.

It is an arithmetic number, because the mean of its divisors is an integer number (80820741).

Almost surely, 2^161641481 is an apocalyptic number.

It is an amenable number.

161641481 is a deficient number, since it is larger than the sum of its proper divisors (1).

161641481 is an equidigital number, since it uses as much as digits as its factorization.

161641481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 161641481 is about 12713.8303040429. The cubic root of 161641481 is about 544.7337374568.

The spelling of 161641481 in words is "one hundred sixty-one million, six hundred forty-one thousand, four hundred eighty-one".