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81058 = 240529
BaseRepresentation
bin10011110010100010
311010012011
4103302202
510043213
61423134
7455215
oct236242
9133164
1081058
115599a
123aaaa
132ab83
142177c
151903d
hex13ca2

81058 has 4 divisors (see below), whose sum is σ = 121590. Its totient is φ = 40528.

The previous prime is 81049. The next prime is 81071. The reversal of 81058 is 85018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85018 = 242509.

It can be written as a sum of positive squares in only one way, i.e., 49729 + 31329 = 223^2 + 177^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 11 and base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20263 + ... + 20266.

281058 is an apocalyptic number.

81058 is a deficient number, since it is larger than the sum of its proper divisors (40532).

81058 is a wasteful number, since it uses less digits than its factorization.

81058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40531.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 81058 is about 284.7068667946. The cubic root of 81058 is about 43.2778118644.

It can be divided in two parts, 810 and 58, that added together give a palindrome (868).

The spelling of 81058 in words is "eighty-one thousand, fifty-eight".

Divisors: 1 2 40529 81058