105609531 has 4 divisors (see below), whose sum is σ = 140812712. Its totient is φ = 70406352.

The previous prime is 105609527. The next prime is 105609547. The reversal of 105609531 is 135906501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135906501 = 3 ⋅45302167.

It is not a de Polignac number, because 105609531 - 2² = 105609527 is a prime.

It is a super-2 number, since 2×105609531² = 22306746076079922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105609331) 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, 17601586 + ... + 17601591.

It is an arithmetic number, because the mean of its divisors is an integer number (35203178).

Almost surely, 2^105609531 is an apocalyptic number.

105609531 is a deficient number, since it is larger than the sum of its proper divisors (35203181).

105609531 is an equidigital number, since it uses as much as digits as its factorization.

105609531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35203180.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 105609531 is about 10276.6497945585. The cubic root of 105609531 is about 472.6805200323.

The spelling of 105609531 in words is "one hundred five million, six hundred nine thousand, five hundred thirty-one".