1115541001 has 4 divisors (see below), whose sum is σ = 1117502100. Its totient is φ = 1113579904.

The previous prime is 1115540971. The next prime is 1115541017. The reversal of 1115541001 is 1001455111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 767345401 + 348195600 = 27701^2 + 18660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1115541001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1115541001.

It is not an unprimeable number, because it can be changed into a prime (1115541701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979696 + ... + 980833.

It is an arithmetic number, because the mean of its divisors is an integer number (279375525).

Almost surely, 2^1115541001 is an apocalyptic number.

It is an amenable number.

1115541001 is a deficient number, since it is larger than the sum of its proper divisors (1961099).

1115541001 is an equidigital number, since it uses as much as digits as its factorization.

1115541001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961098.

The product of its (nonzero) digits is 100, while the sum is 19.

The square root of 1115541001 is about 33399.7155826214. The cubic root of 1115541001 is about 1037.1188131955.

Adding to 1115541001 its reverse (1001455111), we get a palindrome (2116996112).

The spelling of 1115541001 in words is "one billion, one hundred fifteen million, five hundred forty-one thousand, one".