105090391 has 4 divisors (see below), whose sum is σ = 120103312. Its totient is φ = 90077472.

The previous prime is 105090383. The next prime is 105090431. The reversal of 105090391 is 193090501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193090501 = 53 ⋅3643217.

It is a cyclic number.

It is not a de Polignac number, because 105090391 - 2³ = 105090383 is a prime.

It is a super-2 number, since 2×105090391² = 22087980561065762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105091391) 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, 7506450 + ... + 7506463.

It is an arithmetic number, because the mean of its divisors is an integer number (30025828).

Almost surely, 2^105090391 is an apocalyptic number.

105090391 is a deficient number, since it is larger than the sum of its proper divisors (15012921).

105090391 is an equidigital number, since it uses as much as digits as its factorization.

105090391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15012920.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 105090391 is about 10251.3604463017. The cubic root of 105090391 is about 471.9047360528.

The spelling of 105090391 in words is "one hundred five million, ninety thousand, three hundred ninety-one".