161787 has 8 divisors (see below), whose sum is σ = 217600. Its totient is φ = 106920.

The previous prime is 161783. The next prime is 161807. The reversal of 161787 is 787161.

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

It is not a de Polignac number, because 161787 - 2² = 161783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161787.

It is not an unprimeable number, because it can be changed into a prime (161783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462 + ... + 732.

It is an arithmetic number, because the mean of its divisors is an integer number (27200).

2¹⁶¹⁷⁸⁷ is an apocalyptic number.

161787 is a deficient number, since it is larger than the sum of its proper divisors (55813).

161787 is a wasteful number, since it uses less digits than its factorization.

161787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473.

The product of its digits is 2352, while the sum is 30.

The square root of 161787 is about 402.2275475399. The cubic root of 161787 is about 54.4897155355.

The spelling of 161787 in words is "one hundred sixty-one thousand, seven hundred eighty-seven".