161893447 has 2 divisors, whose sum is σ = 161893448. Its totient is φ = 161893446.

The previous prime is 161893411. The next prime is 161893477. The reversal of 161893447 is 744398161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161893447 - 2¹¹ = 161891399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161893477) 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, 80946723 + 80946724.

It is an arithmetic number, because the mean of its divisors is an integer number (80946724).

Almost surely, 2^161893447 is an apocalyptic number.

161893447 is a deficient number, since it is larger than the sum of its proper divisors (1).

161893447 is an equidigital number, since it uses as much as digits as its factorization.

161893447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 161893447 is about 12723.7355756869. The cubic root of 161893447 is about 545.0166333335.

The spelling of 161893447 in words is "one hundred sixty-one million, eight hundred ninety-three thousand, four hundred forty-seven".