11487181 has 2 divisors, whose sum is σ = 11487182. Its totient is φ = 11487180.

The previous prime is 11487163. The next prime is 11487193. The reversal of 11487181 is 18178411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 324900 = 3341^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 11487181 - 2⁹ = 11486669 is a prime.

It is a super-2 number, since 2×11487181² = 263910654653522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11487101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5743590 + 5743591.

It is an arithmetic number, because the mean of its divisors is an integer number (5743591).

Almost surely, 2^11487181 is an apocalyptic number.

It is an amenable number.

11487181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11487181 is an equidigital number, since it uses as much as digits as its factorization.

11487181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 31.

The square root of 11487181 is about 3389.2744061229. The cubic root of 11487181 is about 225.6339716815.

The spelling of 11487181 in words is "eleven million, four hundred eighty-seven thousand, one hundred eighty-one".