161540324 has 72 divisors (see below), whose sum is σ = 340857720. Its totient is φ = 66626560.

The previous prime is 161540297. The next prime is 161540329. The reversal of 161540324 is 423045161.

It can be written as a sum of positive squares in 4 ways, for example, as 100200100 + 61340224 = 10010^2 + 7832^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161540293 and 161540302.

It is not an unprimeable number, because it can be changed into a prime (161540329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238274 + ... + 238950.

It is an arithmetic number, because the mean of its divisors is an integer number (4734135).

Almost surely, 2^161540324 is an apocalyptic number.

It is an amenable number.

161540324 is an abundant number, since it is smaller than the sum of its proper divisors (179317396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161540324 is a wasteful number, since it uses less digits than its factorization.

161540324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 161540324 is about 12709.8514546788. The cubic root of 161540324 is about 544.6200803082.

Adding to 161540324 its reverse (423045161), we get a palindrome (584585485).

The spelling of 161540324 in words is "one hundred sixty-one million, five hundred forty thousand, three hundred twenty-four".