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57161 = 134397
BaseRepresentation
bin1101111101001001
32220102002
431331021
53312121
61120345
7325436
oct157511
986362
1057161
1139a45
12290b5
1320030
1416b8d
1511e0b
hexdf49

57161 has 4 divisors (see below), whose sum is σ = 61572. Its totient is φ = 52752.

The previous prime is 57149. The next prime is 57163. The reversal of 57161 is 16175.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17161 + 40000 = 131^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 57161 - 26 = 57097 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57163) 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, 2186 + ... + 2211.

It is an arithmetic number, because the mean of its divisors is an integer number (15393).

257161 is an apocalyptic number.

It is an amenable number.

57161 is a deficient number, since it is larger than the sum of its proper divisors (4411).

57161 is a wasteful number, since it uses less digits than its factorization.

57161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410.

The product of its digits is 210, while the sum is 20.

The square root of 57161 is about 239.0836673635. The cubic root of 57161 is about 38.5212116766.

The spelling of 57161 in words is "fifty-seven thousand, one hundred sixty-one".

Divisors: 1 13 4397 57161