161887741 has 2 divisors, whose sum is σ = 161887742. Its totient is φ = 161887740.

The previous prime is 161887711. The next prime is 161887763. The reversal of 161887741 is 147788161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99082116 + 62805625 = 9954^2 + 7925^2 .

It is a cyclic number.

It is not a de Polignac number, because 161887741 - 2⁷ = 161887613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161887711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80943870 + 80943871.

It is an arithmetic number, because the mean of its divisors is an integer number (80943871).

Almost surely, 2^161887741 is an apocalyptic number.

It is an amenable number.

161887741 is a deficient number, since it is larger than the sum of its proper divisors (1).

161887741 is an equidigital number, since it uses as much as digits as its factorization.

161887741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 43.

The square root of 161887741 is about 12723.5113471085. The cubic root of 161887741 is about 545.0102301477.

The spelling of 161887741 in words is "one hundred sixty-one million, eight hundred eighty-seven thousand, seven hundred forty-one".