161361428 has 6 divisors (see below), whose sum is σ = 282382506. Its totient is φ = 80680712.

The previous prime is 161361427. The next prime is 161361437. The reversal of 161361428 is 824163161.

It can be written as a sum of positive squares in only one way, i.e., 110923024 + 50438404 = 10532^2 + 7102^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161361394 and 161361403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161361427) 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, 20170175 + ... + 20170182.

It is an arithmetic number, because the mean of its divisors is an integer number (47063751).

Almost surely, 2^161361428 is an apocalyptic number.

It is an amenable number.

161361428 is a deficient number, since it is larger than the sum of its proper divisors (121021078).

161361428 is a wasteful number, since it uses less digits than its factorization.

161361428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340361 (or 40340359 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 161361428 is about 12702.8118147125. The cubic root of 161361428 is about 544.4189616037.

The spelling of 161361428 in words is "one hundred sixty-one million, three hundred sixty-one thousand, four hundred twenty-eight".