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161421 = 3134139
BaseRepresentation
bin100111011010001101
322012102120
4213122031
520131141
63243153
71241421
oct473215
9265376
10161421
11100307
12794b9
1358620
1442b81
1532c66
hex2768d

161421 has 8 divisors (see below), whose sum is σ = 231840. Its totient is φ = 99312.

The previous prime is 161411. The next prime is 161453. The reversal of 161421 is 124161.

161421 is nontrivially palindromic in base 7.

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

It is not a de Polignac number, because 161421 - 210 = 160397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161421.

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 161421.

It is not an unprimeable number, because it can be changed into a prime (161411) 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, 2031 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (28980).

2161421 is an apocalyptic number.

It is an amenable number.

161421 is a deficient number, since it is larger than the sum of its proper divisors (70419).

161421 is a wasteful number, since it uses less digits than its factorization.

161421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155.

The product of its digits is 48, while the sum is 15.

The square root of 161421 is about 401.7723235864. The cubic root of 161421 is about 54.4485950219.

Adding to 161421 its reverse (124161), we get a palindrome (285582).

The spelling of 161421 in words is "one hundred sixty-one thousand, four hundred twenty-one".

Divisors: 1 3 13 39 4139 12417 53807 161421