161877 has 4 divisors (see below), whose sum is σ = 215840. Its totient is φ = 107916.

The previous prime is 161873. The next prime is 161879. The reversal of 161877 is 778161.

161877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 778161 = 3 ⋅259387.

It is not a de Polignac number, because 161877 - 2² = 161873 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26977 + ... + 26982.

It is an arithmetic number, because the mean of its divisors is an integer number (53960).

2¹⁶¹⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

161877 is a deficient number, since it is larger than the sum of its proper divisors (53963).

161877 is an equidigital number, since it uses as much as digits as its factorization.

161877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53962.

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

The square root of 161877 is about 402.3394089572. The cubic root of 161877 is about 54.4998176354.

The spelling of 161877 in words is "one hundred sixty-one thousand, eight hundred seventy-seven".