161801747 has 2 divisors, whose sum is σ = 161801748. Its totient is φ = 161801746.

The previous prime is 161801729. The next prime is 161801753. The reversal of 161801747 is 747108161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161801747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161801147) 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, 80900873 + 80900874.

It is an arithmetic number, because the mean of its divisors is an integer number (80900874).

Almost surely, 2^161801747 is an apocalyptic number.

161801747 is a deficient number, since it is larger than the sum of its proper divisors (1).

161801747 is an equidigital number, since it uses as much as digits as its factorization.

161801747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 161801747 is about 12720.1315637850. The cubic root of 161801747 is about 544.9137107726.

The spelling of 161801747 in words is "one hundred sixty-one million, eight hundred one thousand, seven hundred forty-seven".