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321157 = 1916903
BaseRepresentation
bin1001110011010000101
3121022112201
41032122011
540234112
610514501
72505214
oct1163205
9538481
10321157
111aa321
12135a31
13b3245
148507b
1565257
hex4e685

321157 has 4 divisors (see below), whose sum is σ = 338080. Its totient is φ = 304236.

The previous prime is 321143. The next prime is 321163. The reversal of 321157 is 751123.

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 not a de Polignac number, because 321157 - 215 = 288389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 16903 = 321157 / (3 + 2 + 1 + 1 + 5 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321187) 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, 8433 + ... + 8470.

It is an arithmetic number, because the mean of its divisors is an integer number (84520).

2321157 is an apocalyptic number.

It is an amenable number.

321157 is a deficient number, since it is larger than the sum of its proper divisors (16923).

321157 is a wasteful number, since it uses less digits than its factorization.

321157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16922.

The product of its digits is 210, while the sum is 19.

The square root of 321157 is about 566.7071554163. The cubic root of 321157 is about 68.4813738051.

The spelling of 321157 in words is "three hundred twenty-one thousand, one hundred fifty-seven".

Divisors: 1 19 16903 321157