11631287 has 4 divisors (see below), whose sum is σ = 12243480. Its totient is φ = 11019096.

The previous prime is 11631271. The next prime is 11631289. The reversal of 11631287 is 78213611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78213611 = 7 ⋅11173373.

It is a cyclic number.

It is not a de Polignac number, because 11631287 - 2⁴ = 11631271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11631289) 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, 306068 + ... + 306105.

It is an arithmetic number, because the mean of its divisors is an integer number (3060870).

Almost surely, 2^11631287 is an apocalyptic number.

11631287 is a deficient number, since it is larger than the sum of its proper divisors (612193).

11631287 is an equidigital number, since it uses as much as digits as its factorization.

11631287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612192.

The product of its digits is 2016, while the sum is 29.

The square root of 11631287 is about 3410.4672700379. The cubic root of 11631287 is about 226.5735750464.

Adding to 11631287 its reverse (78213611), we get a palindrome (89844898).

The spelling of 11631287 in words is "eleven million, six hundred thirty-one thousand, two hundred eighty-seven".