10109491 has 4 divisors (see below), whose sum is σ = 11553712. Its totient is φ = 8665272.

The previous prime is 10109479. The next prime is 10109497. The reversal of 10109491 is 19490101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19490101 = 47 ⋅414683.

It is not a de Polignac number, because 10109491 - 2⁵ = 10109459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10109497) 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, 722100 + ... + 722113.

It is an arithmetic number, because the mean of its divisors is an integer number (2888428).

Almost surely, 2^10109491 is an apocalyptic number.

10109491 is a deficient number, since it is larger than the sum of its proper divisors (1444221).

10109491 is an equidigital number, since it uses as much as digits as its factorization.

10109491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444220.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 10109491 is about 3179.5425771642. The cubic root of 10109491 is about 216.2269205881.

Adding to 10109491 its reverse (19490101), we get a palindrome (29599592).

It can be divided in two parts, 1010 and 9491, that added together give a palindrome (10501).

The spelling of 10109491 in words is "ten million, one hundred nine thousand, four hundred ninety-one".