13111491 has 4 divisors (see below), whose sum is σ = 17481992. Its totient is φ = 8740992.

The previous prime is 13111489. The next prime is 13111493. The reversal of 13111491 is 19411131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19411131 = 3 ⋅6470377.

It is an interprime number because it is at equal distance from previous prime (13111489) and next prime (13111493).

It is not a de Polignac number, because 13111491 - 2¹ = 13111489 is a prime.

It is a super-2 number, since 2×13111491² = 343822392486162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13111493) 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, 2185246 + ... + 2185251.

It is an arithmetic number, because the mean of its divisors is an integer number (4370498).

Almost surely, 2^13111491 is an apocalyptic number.

13111491 is a deficient number, since it is larger than the sum of its proper divisors (4370501).

13111491 is an equidigital number, since it uses as much as digits as its factorization.

13111491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370500.

The product of its digits is 108, while the sum is 21.

The square root of 13111491 is about 3620.9792874304. The cubic root of 13111491 is about 235.8037425640.

The spelling of 13111491 in words is "thirteen million, one hundred eleven thousand, four hundred ninety-one".