105520391 has 2 divisors, whose sum is σ = 105520392. Its totient is φ = 105520390.

The previous prime is 105520381. The next prime is 105520399. The reversal of 105520391 is 193025501.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 105520391 - 2¹⁰ = 105519367 is a prime.

It is a super-2 number, since 2×105520391² = 22269105833585762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 105520391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105520399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52760195 + 52760196.

It is an arithmetic number, because the mean of its divisors is an integer number (52760196).

Almost surely, 2^105520391 is an apocalyptic number.

105520391 is a deficient number, since it is larger than the sum of its proper divisors (1).

105520391 is an equidigital number, since it uses as much as digits as its factorization.

105520391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 105520391 is about 10272.3118624777. The cubic root of 105520391 is about 472.5474935230.

Adding to 105520391 its reverse (193025501), we get a palindrome (298545892).

The spelling of 105520391 in words is "one hundred five million, five hundred twenty thousand, three hundred ninety-one".