105312131 has 4 divisors (see below), whose sum is σ = 105351312. Its totient is φ = 105272952.

The previous prime is 105312121. The next prime is 105312173. The reversal of 105312131 is 131213501.

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-105312131 is a prime.

It is a super-2 number, since 2×105312131² = 22181289871522322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105312121) 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, 15236 + ... + 21041.

It is an arithmetic number, because the mean of its divisors is an integer number (26337828).

Almost surely, 2^105312131 is an apocalyptic number.

105312131 is a deficient number, since it is larger than the sum of its proper divisors (39181).

105312131 is an equidigital number, since it uses as much as digits as its factorization.

105312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39180.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 105312131 is about 10262.1698972488. The cubic root of 105312131 is about 472.2364081326.

Adding to 105312131 its reverse (131213501), we get a palindrome (236525632).

The spelling of 105312131 in words is "one hundred five million, three hundred twelve thousand, one hundred thirty-one".