105219391 has 2 divisors, whose sum is σ = 105219392. Its totient is φ = 105219390.

The previous prime is 105219383. The next prime is 105219403. The reversal of 105219391 is 193912501.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 105219391 - 2³ = 105219383 is a prime.

It is a super-2 number, since 2×105219391² = 22142240484821762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105219311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52609695 + 52609696.

It is an arithmetic number, because the mean of its divisors is an integer number (52609696).

Almost surely, 2^105219391 is an apocalyptic number.

105219391 is a deficient number, since it is larger than the sum of its proper divisors (1).

105219391 is an equidigital number, since it uses as much as digits as its factorization.

105219391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 105219391 is about 10257.6503644841. The cubic root of 105219391 is about 472.0977471002.

The spelling of 105219391 in words is "one hundred five million, two hundred nineteen thousand, three hundred ninety-one".