161881747 has 2 divisors, whose sum is σ = 161881748. Its totient is φ = 161881746.

The previous prime is 161881717. The next prime is 161881757. The reversal of 161881747 is 747188161.

161881747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161881747 - 2¹⁵ = 161848979 is a prime.

It is not a weakly prime, because it can be changed into another prime (161881717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80940873 + 80940874.

It is an arithmetic number, because the mean of its divisors is an integer number (80940874).

Almost surely, 2^161881747 is an apocalyptic number.

161881747 is a deficient number, since it is larger than the sum of its proper divisors (1).

161881747 is an equidigital number, since it uses as much as digits as its factorization.

161881747 is an evil number, because the sum of its binary digits is even.

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

The square root of 161881747 is about 12723.2757967435. The cubic root of 161881747 is about 545.0035036107.

The spelling of 161881747 in words is "one hundred sixty-one million, eight hundred eighty-one thousand, seven hundred forty-seven".