161985524 has 6 divisors (see below), whose sum is σ = 283474674. Its totient is φ = 80992760.

The previous prime is 161985511. The next prime is 161985557. The reversal of 161985524 is 425589161.

161985524 is digitally balanced in base 3, 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., 140659600 + 21325924 = 11860^2 + 4618^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20248187 + ... + 20248194.

It is an arithmetic number, because the mean of its divisors is an integer number (47245779).

Almost surely, 2^161985524 is an apocalyptic number.

It is an amenable number.

161985524 is a deficient number, since it is larger than the sum of its proper divisors (121489150).

161985524 is a wasteful number, since it uses less digits than its factorization.

161985524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40496385 (or 40496383 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 161985524 is about 12727.3533776665. The cubic root of 161985524 is about 545.1199399353.

The spelling of 161985524 in words is "one hundred sixty-one million, nine hundred eighty-five thousand, five hundred twenty-four".