161677 has 4 divisors (see below), whose sum is σ = 163296. Its totient is φ = 160060.

The previous prime is 161659. The next prime is 161683. The reversal of 161677 is 776161.

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: 776161 = 881².

It is a cyclic number.

It is not a de Polignac number, because 161677 - 2¹¹ = 159629 is a prime.

It is a super-2 number, since 2×161677² = 52278904658, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649 + ... + 862.

It is an arithmetic number, because the mean of its divisors is an integer number (40824).

2¹⁶¹⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

161677 is a deficient number, since it is larger than the sum of its proper divisors (1619).

161677 is a wasteful number, since it uses less digits than its factorization.

161677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618.

The product of its digits is 1764, while the sum is 28.

The square root of 161677 is about 402.0907857686. The cubic root of 161677 is about 54.4773634354.

It can be divided in two parts, 161 and 677, that added together give a palindrome (838).

The spelling of 161677 in words is "one hundred sixty-one thousand, six hundred seventy-seven".