105442391 has 2 divisors, whose sum is σ = 105442392. Its totient is φ = 105442390.

The previous prime is 105442357. The next prime is 105442427. The reversal of 105442391 is 193244501.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 105442391 - 2¹⁸ = 105180247 is a prime.

It is a super-2 number, since 2×105442391² = 22236195639593762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105442301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52721195 + 52721196.

It is an arithmetic number, because the mean of its divisors is an integer number (52721196).

Almost surely, 2^105442391 is an apocalyptic number.

105442391 is a deficient number, since it is larger than the sum of its proper divisors (1).

105442391 is an equidigital number, since it uses as much as digits as its factorization.

105442391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 105442391 is about 10268.5145469050. The cubic root of 105442391 is about 472.4310301242.

Adding to 105442391 its reverse (193244501), we get a palindrome (298686892).

The spelling of 105442391 in words is "one hundred five million, four hundred forty-two thousand, three hundred ninety-one".