161401 has 4 divisors (see below), whose sum is σ = 163072. Its totient is φ = 159732.

The previous prime is 161387. The next prime is 161407. The reversal of 161401 is 104161.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161407) 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, 681 + ... + 886.

It is an arithmetic number, because the mean of its divisors is an integer number (40768).

2¹⁶¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

161401 is a deficient number, since it is larger than the sum of its proper divisors (1671).

161401 is a wasteful number, since it uses less digits than its factorization.

161401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 161401 is about 401.7474330970. The cubic root of 161401 is about 54.4463462090.

Adding to 161401 its reverse (104161), we get a palindrome (265562).

The spelling of 161401 in words is "one hundred sixty-one thousand, four hundred one".