105806531 has 4 divisors (see below), whose sum is σ = 108267192. Its totient is φ = 103345872.

The previous prime is 105806501. The next prime is 105806557. The reversal of 105806531 is 135608501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135608501 = 7 ⋅19372643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105806531 is a prime.

It is a super-2 number, since 2×105806531² = 22390044004507922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105806494 and 105806503.

It is not an unprimeable number, because it can be changed into a prime (105806501) 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, 1230266 + ... + 1230351.

It is an arithmetic number, because the mean of its divisors is an integer number (27066798).

Almost surely, 2^105806531 is an apocalyptic number.

105806531 is a deficient number, since it is larger than the sum of its proper divisors (2460661).

105806531 is an equidigital number, since it uses as much as digits as its factorization.

105806531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460660.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 105806531 is about 10286.2301646424. The cubic root of 105806531 is about 472.9742442251.

The spelling of 105806531 in words is "one hundred five million, eight hundred six thousand, five hundred thirty-one".