161389783 has 4 divisors (see below), whose sum is σ = 162113728. Its totient is φ = 160665840.

The previous prime is 161389763. The next prime is 161389807. The reversal of 161389783 is 387983161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 387983161 = 53 ⋅7320437.

It is a cyclic number.

It is not a de Polignac number, because 161389783 - 2⁹ = 161389271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161389763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361638 + ... + 362083.

It is an arithmetic number, because the mean of its divisors is an integer number (40528432).

Almost surely, 2^161389783 is an apocalyptic number.

161389783 is a deficient number, since it is larger than the sum of its proper divisors (723945).

161389783 is an equidigital number, since it uses as much as digits as its factorization.

161389783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723944.

The product of its digits is 217728, while the sum is 46.

The square root of 161389783 is about 12703.9278571629. The cubic root of 161389783 is about 544.4508488102.

It can be divided in two parts, 16138 and 9783, that added together give a square (25921 = 161²).

The spelling of 161389783 in words is "one hundred sixty-one million, three hundred eighty-nine thousand, seven hundred eighty-three".