11487731 has 4 divisors (see below), whose sum is σ = 11497200. Its totient is φ = 11478264.

The previous prime is 11487709. The next prime is 11487737. The reversal of 11487731 is 13778411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13778411 = 3217 ⋅4283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11487731 is a prime.

It is a super-2 number, since 2×11487731² = 263935927056722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11487737) 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, 2591 + ... + 5448.

It is an arithmetic number, because the mean of its divisors is an integer number (2874300).

Almost surely, 2^11487731 is an apocalyptic number.

11487731 is a deficient number, since it is larger than the sum of its proper divisors (9469).

11487731 is an equidigital number, since it uses as much as digits as its factorization.

11487731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9468.

The product of its digits is 4704, while the sum is 32.

The square root of 11487731 is about 3389.3555434625. The cubic root of 11487731 is about 225.6375727015.

The spelling of 11487731 in words is "eleven million, four hundred eighty-seven thousand, seven hundred thirty-one".