161678141 has 2 divisors, whose sum is σ = 161678142. Its totient is φ = 161678140.

The previous prime is 161678131. The next prime is 161678189. The reversal of 161678141 is 141876161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158030041 + 3648100 = 12571^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 161678141 - 2¹⁴ = 161661757 is a prime.

It is a super-2 number, since 2×161678141² = 52279642554431762, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161678131) 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, 80839070 + 80839071.

It is an arithmetic number, because the mean of its divisors is an integer number (80839071).

Almost surely, 2^161678141 is an apocalyptic number.

It is an amenable number.

161678141 is a deficient number, since it is larger than the sum of its proper divisors (1).

161678141 is an equidigital number, since it uses as much as digits as its factorization.

161678141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 161678141 is about 12715.2719593409. The cubic root of 161678141 is about 544.7749158911.

The spelling of 161678141 in words is "one hundred sixty-one million, six hundred seventy-eight thousand, one hundred forty-one".