11865131 has 2 divisors, whose sum is σ = 11865132. Its totient is φ = 11865130.

The previous prime is 11865107. The next prime is 11865143. The reversal of 11865131 is 13156811.

11865131 is nontrivially palindromic in base 5.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11865131 - 2⁶ = 11865067 is a prime.

It is a super-2 number, since 2×11865131² = 281562667294322, 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 11865131.

It is not a weakly prime, because it can be changed into another prime (11865151) 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, 5932565 + 5932566.

It is an arithmetic number, because the mean of its divisors is an integer number (5932566).

Almost surely, 2^11865131 is an apocalyptic number.

11865131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11865131 is an equidigital number, since it uses as much as digits as its factorization.

11865131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 26.

The square root of 11865131 is about 3444.5799453634. The cubic root of 11865131 is about 228.0819124477.

The spelling of 11865131 in words is "eleven million, eight hundred sixty-five thousand, one hundred thirty-one".