161393744 has 10 divisors (see below), whose sum is σ = 312700410. Its totient is φ = 80696864.

The previous prime is 161393731. The next prime is 161393747. The reversal of 161393744 is 447393161.

It can be written as a sum of positive squares in only one way, i.e., 106337344 + 55056400 = 10312^2 + 7420^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161393698 and 161393707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161393747) 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, 5043539 + ... + 5043570.

It is an arithmetic number, because the mean of its divisors is an integer number (31270041).

Almost surely, 2^161393744 is an apocalyptic number.

It is an amenable number.

161393744 is a deficient number, since it is larger than the sum of its proper divisors (151306666).

161393744 is a wasteful number, since it uses less digits than its factorization.

161393744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10087117 (or 10087111 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 161393744 is about 12704.0837528725. The cubic root of 161393744 is about 544.4553029380.

The spelling of 161393744 in words is "one hundred sixty-one million, three hundred ninety-three thousand, seven hundred forty-four".