105919521 has 4 divisors (see below), whose sum is σ = 141226032. Its totient is φ = 70613012.

The previous prime is 105919507. The next prime is 105919553. The reversal of 105919521 is 125919501.

It is a happy number.

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: 125919501 = 3 ⋅41973167.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105919521 is a prime.

It is a super-2 number, since 2×105919521² = 22437889857738882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105919421) 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, 17653251 + ... + 17653256.

It is an arithmetic number, because the mean of its divisors is an integer number (35306508).

Almost surely, 2^105919521 is an apocalyptic number.

It is an amenable number.

105919521 is a deficient number, since it is larger than the sum of its proper divisors (35306511).

105919521 is an equidigital number, since it uses as much as digits as its factorization.

105919521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35306510.

The product of its (nonzero) digits is 4050, while the sum is 33.

The square root of 105919521 is about 10291.7209931090. The cubic root of 105919521 is about 473.1425462112.

The spelling of 105919521 in words is "one hundred five million, nine hundred nineteen thousand, five hundred twenty-one".