161787965 has 8 divisors (see below), whose sum is σ = 194261760. Its totient is φ = 129352912.

The previous prime is 161787953. The next prime is 161787991. The reversal of 161787965 is 569787161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161787965 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 476 + ... + 17994.

It is an arithmetic number, because the mean of its divisors is an integer number (24282720).

Almost surely, 2^161787965 is an apocalyptic number.

It is an amenable number.

161787965 is a deficient number, since it is larger than the sum of its proper divisors (32473795).

161787965 is a wasteful number, since it uses less digits than its factorization.

161787965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19371.

The product of its digits is 635040, while the sum is 50.

The square root of 161787965 is about 12719.5898125686. The cubic root of 161787965 is about 544.8982387229.

The spelling of 161787965 in words is "one hundred sixty-one million, seven hundred eighty-seven thousand, nine hundred sixty-five".