11571487 has 2 divisors, whose sum is σ = 11571488. Its totient is φ = 11571486.

The previous prime is 11571481. The next prime is 11571557. The reversal of 11571487 is 78417511.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11571487 is a prime.

It is a super-2 number, since 2×11571487² = 267798622782338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11571481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5785743 + 5785744.

It is an arithmetic number, because the mean of its divisors is an integer number (5785744).

Almost surely, 2^11571487 is an apocalyptic number.

11571487 is a deficient number, since it is larger than the sum of its proper divisors (1).

11571487 is an equidigital number, since it uses as much as digits as its factorization.

11571487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 34.

The square root of 11571487 is about 3401.6888452650. The cubic root of 11571487 is about 226.1846130350.

Adding to 11571487 its reverse (78417511), we get a palindrome (89988998).

The spelling of 11571487 in words is "eleven million, five hundred seventy-one thousand, four hundred eighty-seven".