1118147581 has 2 divisors, whose sum is σ = 1118147582. Its totient is φ = 1118147580.

The previous prime is 1118147573. The next prime is 1118147651. The reversal of 1118147581 is 1857418111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 903964356 + 214183225 = 30066^2 + 14635^2 .

It is an emirp because it is prime and its reverse (1857418111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1118147581 - 2³ = 1118147573 is a prime.

It is a super-2 number, since 2×1118147581² = 2500508025792303122, 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 1118147581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1118147501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559073790 + 559073791.

It is an arithmetic number, because the mean of its divisors is an integer number (559073791).

Almost surely, 2^1118147581 is an apocalyptic number.

It is an amenable number.

1118147581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118147581 is an equidigital number, since it uses as much as digits as its factorization.

1118147581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 37.

The square root of 1118147581 is about 33438.7138060064. The cubic root of 1118147581 is about 1037.9259642672.

The spelling of 1118147581 in words is "one billion, one hundred eighteen million, one hundred forty-seven thousand, five hundred eighty-one".