11287431 has 20 divisors (see below), whose sum is σ = 16952584. Its totient is φ = 7484400.

The previous prime is 11287429. The next prime is 11287453. The reversal of 11287431 is 13478211.

It is not a de Polignac number, because 11287431 - 2¹ = 11287429 is a prime.

It is a super-2 number, since 2×11287431² = 254812197159522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11287395 and 11287404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11287481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26601 + ... + 27021.

Almost surely, 2^11287431 is an apocalyptic number.

11287431 is a deficient number, since it is larger than the sum of its proper divisors (5665153).

11287431 is an equidigital number, since it uses as much as digits as its factorization.

11287431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 755 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 11287431 is about 3359.6772166385. The cubic root of 11287431 is about 224.3184710545.

The spelling of 11287431 in words is "eleven million, two hundred eighty-seven thousand, four hundred thirty-one".