105906553 has 4 divisors (see below), whose sum is σ = 107642788. Its totient is φ = 104170320.

The previous prime is 105906547. The next prime is 105906569. The reversal of 105906553 is 355609501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355609501 = 13 ⋅27354577.

It can be written as a sum of positive squares in 2 ways, for example, as 2111209 + 103795344 = 1453^2 + 10188^2 .

It is a cyclic number.

It is not a de Polignac number, because 105906553 - 2⁹ = 105906041 is a prime.

It is a super-2 number, since 2×105906553² = 22432395936683618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105906503) 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, 868026 + ... + 868147.

It is an arithmetic number, because the mean of its divisors is an integer number (26910697).

Almost surely, 2^105906553 is an apocalyptic number.

It is an amenable number.

105906553 is a deficient number, since it is larger than the sum of its proper divisors (1736235).

105906553 is an equidigital number, since it uses as much as digits as its factorization.

105906553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736234.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 105906553 is about 10291.0909528582. The cubic root of 105906553 is about 473.1232360692.

The spelling of 105906553 in words is "one hundred five million, nine hundred six thousand, five hundred fifty-three".