105724231 has 4 divisors (see below), whose sum is σ = 105745264. Its totient is φ = 105703200.

The previous prime is 105724211. The next prime is 105724237. The reversal of 105724231 is 132427501.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105724231 is a prime.

It is a super-2 number, since 2×105724231² = 22355226041082722, 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 = 105724196 and 105724205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105724237) 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, 1951 + ... + 14671.

It is an arithmetic number, because the mean of its divisors is an integer number (26436316).

Almost surely, 2^105724231 is an apocalyptic number.

105724231 is a deficient number, since it is larger than the sum of its proper divisors (21033).

105724231 is an equidigital number, since it uses as much as digits as its factorization.

105724231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21032.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 105724231 is about 10282.2288926088. The cubic root of 105724231 is about 472.8515804761.

The spelling of 105724231 in words is "one hundred five million, seven hundred twenty-four thousand, two hundred thirty-one".