105420545 has 4 divisors (see below), whose sum is σ = 126504660. Its totient is φ = 84336432.

The previous prime is 105420533. The next prime is 105420559. The reversal of 105420545 is 545024501.

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 77457601 + 27962944 = 8801^2 + 5288^2 .

It is a cyclic number.

It is not a de Polignac number, because 105420545 - 2⁴ = 105420529 is a prime.

It is a super-2 number, since 2×105420545² = 22226982616194050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10542050 + ... + 10542059.

It is an arithmetic number, because the mean of its divisors is an integer number (31626165).

Almost surely, 2^105420545 is an apocalyptic number.

It is an amenable number.

105420545 is a deficient number, since it is larger than the sum of its proper divisors (21084115).

105420545 is an equidigital number, since it uses as much as digits as its factorization.

105420545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21084114.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 105420545 is about 10267.4507546908. The cubic root of 105420545 is about 472.3984011185.

The spelling of 105420545 in words is "one hundred five million, four hundred twenty thousand, five hundred forty-five".