161442436 has 9 divisors (see below), whose sum is σ = 282568741. Its totient is φ = 80708512.

The previous prime is 161442431. The next prime is 161442439. The reversal of 161442436 is 634244161.

The square root of 161442436 is 12706.

It is a perfect power (a square), and thus also a powerful number.

161442436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 74132100 + 87310336 = 8610^2 + 9344^2 .

It is a super-2 number, since 2×161442436² = 52127320283228192, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161442398 and 161442407.

It is not an unprimeable number, because it can be changed into a prime (161442431) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22236 + ... + 28588.

Almost surely, 2^161442436 is an apocalyptic number.

161442436 is the 12706-th square number.

It is an amenable number.

161442436 is a deficient number, since it is larger than the sum of its proper divisors (121126305).

161442436 is an frugal number, since it uses more digits than its factorization.

161442436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12710 (or 6355 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The cubic root of 161442436 is about 544.5100509337.

Adding to 161442436 its reverse (634244161), we get a palindrome (795686597).

The spelling of 161442436 in words is "one hundred sixty-one million, four hundred forty-two thousand, four hundred thirty-six".