11491903 has 4 divisors (see below), whose sum is σ = 12096760. Its totient is φ = 10887048.

The previous prime is 11491901. The next prime is 11491919. The reversal of 11491903 is 30919411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30919411 = 293 ⋅105527.

It is a cyclic number.

It is not a de Polignac number, because 11491903 - 2¹ = 11491901 is a prime.

It is a super-2 number, since 2×11491903² = 264127669122818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11491901) 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, 302400 + ... + 302437.

It is an arithmetic number, because the mean of its divisors is an integer number (3024190).

Almost surely, 2^11491903 is an apocalyptic number.

11491903 is a deficient number, since it is larger than the sum of its proper divisors (604857).

11491903 is an equidigital number, since it uses as much as digits as its factorization.

11491903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604856.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 11491903 is about 3389.9709438283. The cubic root of 11491903 is about 225.6648843327.

The spelling of 11491903 in words is "eleven million, four hundred ninety-one thousand, nine hundred three".