11287531 has 2 divisors, whose sum is σ = 11287532. Its totient is φ = 11287530.

The previous prime is 11287519. The next prime is 11287559. The reversal of 11287531 is 13578211.

It is an a-pointer prime, because the next prime (11287559) can be obtained adding 11287531 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11287531 - 2²³ = 2898923 is a prime.

It is a super-2 number, since 2×11287531² = 254816712151922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11287531.

It is not a weakly prime, because it can be changed into another prime (11287511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5643765 + 5643766.

It is an arithmetic number, because the mean of its divisors is an integer number (5643766).

Almost surely, 2^11287531 is an apocalyptic number.

11287531 is the 1503-rd centered decagonal number.

11287531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11287531 is an equidigital number, since it uses as much as digits as its factorization.

11287531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 11287531 is about 3359.6920989876. The cubic root of 11287531 is about 224.3191334958.

The spelling of 11287531 in words is "eleven million, two hundred eighty-seven thousand, five hundred thirty-one".