105630521 has 4 divisors (see below), whose sum is σ = 105692532. Its totient is φ = 105568512.

The previous prime is 105630509. The next prime is 105630529. The reversal of 105630521 is 125036501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125036501 = 10487 ⋅11923.

It can be written as a sum of positive squares in 2 ways, for example, as 37650496 + 67980025 = 6136^2 + 8245^2 .

It is a cyclic number.

It is not a de Polignac number, because 105630521 - 2¹⁸ = 105368377 is a prime.

It is a super-2 number, since 2×105630521² = 22315613933462882, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105630529) 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, 28376 + ... + 31881.

It is an arithmetic number, because the mean of its divisors is an integer number (26423133).

Almost surely, 2^105630521 is an apocalyptic number.

It is an amenable number.

105630521 is a deficient number, since it is larger than the sum of its proper divisors (62011).

105630521 is an equidigital number, since it uses as much as digits as its factorization.

105630521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62010.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 105630521 is about 10277.6709910368. The cubic root of 105630521 is about 472.7118332000.

The spelling of 105630521 in words is "one hundred five million, six hundred thirty thousand, five hundred twenty-one".