161783 has 2 divisors, whose sum is σ = 161784. Its totient is φ = 161782.

The previous prime is 161779. The next prime is 161807. The reversal of 161783 is 387161.

It is a weak prime.

It is an emirp because it is prime and its reverse (387161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161783 - 2² = 161779 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80891 + 80892.

It is an arithmetic number, because the mean of its divisors is an integer number (80892).

2¹⁶¹⁷⁸³ is an apocalyptic number.

161783 is a deficient number, since it is larger than the sum of its proper divisors (1).

161783 is an equidigital number, since it uses as much as digits as its factorization.

161783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 161783 is about 402.2225751994. Note that the first 3 decimals coincide. The cubic root of 161783 is about 54.4892664663.

The spelling of 161783 in words is "one hundred sixty-one thousand, seven hundred eighty-three".