161987324 has 6 divisors (see below), whose sum is σ = 283477824. Its totient is φ = 80993660.

The previous prime is 161987323. The next prime is 161987347. The reversal of 161987324 is 423789161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161987323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20248412 + ... + 20248419.

It is an arithmetic number, because the mean of its divisors is an integer number (47246304).

Almost surely, 2^161987324 is an apocalyptic number.

It is an amenable number.

161987324 is a deficient number, since it is larger than the sum of its proper divisors (121490500).

161987324 is a wasteful number, since it uses less digits than its factorization.

161987324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40496835 (or 40496833 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 161987324 is about 12727.4240913077. The cubic root of 161987324 is about 545.1219590710.

The spelling of 161987324 in words is "one hundred sixty-one million, nine hundred eighty-seven thousand, three hundred twenty-four".