161641547 has 2 divisors, whose sum is σ = 161641548. Its totient is φ = 161641546.

The previous prime is 161641537. The next prime is 161641549. The reversal of 161641547 is 745146161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161641547 - 2¹² = 161637451 is a prime.

It is a super-3 number, since 3×161641547³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 161641549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161641549) 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, 80820773 + 80820774.

It is an arithmetic number, because the mean of its divisors is an integer number (80820774).

Almost surely, 2^161641547 is an apocalyptic number.

161641547 is a deficient number, since it is larger than the sum of its proper divisors (1).

161641547 is an equidigital number, since it uses as much as digits as its factorization.

161641547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 161641547 is about 12713.8328996412. The cubic root of 161641547 is about 544.7338115971.

The spelling of 161641547 in words is "one hundred sixty-one million, six hundred forty-one thousand, five hundred forty-seven".