105213531 has 8 divisors (see below), whose sum is σ = 141389824. Its totient is φ = 69589800.

The previous prime is 105213529. The next prime is 105213557. The reversal of 105213531 is 135312501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 105213531 - 2¹ = 105213529 is a prime.

It is a super-2 number, since 2×105213531² = 22139774210975922, 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 = 105213498 and 105213507.

It is not an unprimeable number, because it can be changed into a prime (105213331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137695 + ... + 138456.

It is an arithmetic number, because the mean of its divisors is an integer number (17673728).

Almost surely, 2^105213531 is an apocalyptic number.

105213531 is a deficient number, since it is larger than the sum of its proper divisors (36176293).

105213531 is a wasteful number, since it uses less digits than its factorization.

105213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276281.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 105213531 is about 10257.3647200438. The cubic root of 105213531 is about 472.0889827329.

The spelling of 105213531 in words is "one hundred five million, two hundred thirteen thousand, five hundred thirty-one".