105431309 has 4 divisors (see below), whose sum is σ = 106103004. Its totient is φ = 104759616.

The previous prime is 105431303. The next prime is 105431311. The reversal of 105431309 is 903134501.

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 42863209 + 62568100 = 6547^2 + 7910^2 .

It is a cyclic number.

It is not a de Polignac number, because 105431309 - 2¹² = 105427213 is a prime.

It is a super-2 number, since 2×105431309² = 22231521834906962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105431303) 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, 335612 + ... + 335925.

It is an arithmetic number, because the mean of its divisors is an integer number (26525751).

Almost surely, 2^105431309 is an apocalyptic number.

It is an amenable number.

105431309 is a deficient number, since it is larger than the sum of its proper divisors (671695).

105431309 is an equidigital number, since it uses as much as digits as its factorization.

105431309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671694.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 105431309 is about 10267.9749220574. The cubic root of 105431309 is about 472.4144787036.

The spelling of 105431309 in words is "one hundred five million, four hundred thirty-one thousand, three hundred nine".