103891091 has 4 divisors (see below), whose sum is σ = 103923432. Its totient is φ = 103858752.

The previous prime is 103891043. The next prime is 103891093. The reversal of 103891091 is 190198301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190198301 = 1039 ⋅183059.

It is a cyclic number.

It is not a de Polignac number, because 103891091 - 2⁶ = 103891027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103891093) 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, 10745 + ... + 17978.

It is an arithmetic number, because the mean of its divisors is an integer number (25980858).

Almost surely, 2^103891091 is an apocalyptic number.

103891091 is a deficient number, since it is larger than the sum of its proper divisors (32341).

103891091 is an equidigital number, since it uses as much as digits as its factorization.

103891091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32340.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 103891091 is about 10192.6979254759. The cubic root of 103891091 is about 470.1027253959.

It can be divided in two parts, 1038 and 91091, that added together give a palindrome (92129).

The spelling of 103891091 in words is "one hundred three million, eight hundred ninety-one thousand, ninety-one".