105125581 has 4 divisors (see below), whose sum is σ = 114682464. Its totient is φ = 95568700.

The previous prime is 105125549. The next prime is 105125591. The reversal of 105125581 is 185521501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185521501 = 11 ⋅16865591.

It is a cyclic number.

It is not a de Polignac number, because 105125581 - 2⁵ = 105125549 is a prime.

It is a super-2 number, since 2×105125581² = 22102775561175122, 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 (105125521) 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, 4778425 + ... + 4778446.

It is an arithmetic number, because the mean of its divisors is an integer number (28670616).

Almost surely, 2^105125581 is an apocalyptic number.

105125581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

105125581 is the 5481-st centered heptagonal number.

It is an amenable number.

105125581 is a deficient number, since it is larger than the sum of its proper divisors (9556883).

105125581 is an equidigital number, since it uses as much as digits as its factorization.

105125581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9556882.

The product of its (nonzero) digits is 2000, while the sum is 28.

The square root of 105125581 is about 10253.0766602030. The cubic root of 105125581 is about 471.9574033305.

The spelling of 105125581 in words is "one hundred five million, one hundred twenty-five thousand, five hundred eighty-one".