1115552381 has 4 divisors (see below), whose sum is σ = 1117513500. Its totient is φ = 1113591264.

The previous prime is 1115552369. The next prime is 1115552387. The reversal of 1115552381 is 1832555111.

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 610831225 + 504721156 = 24715^2 + 22466^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115552381 - 2¹⁰ = 1115551357 is a prime.

It is a super-2 number, since 2×1115552381² = 2488914229509538322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115552387) 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, 979706 + ... + 980843.

It is an arithmetic number, because the mean of its divisors is an integer number (279378375).

Almost surely, 2^1115552381 is an apocalyptic number.

It is an amenable number.

1115552381 is a deficient number, since it is larger than the sum of its proper divisors (1961119).

1115552381 is an equidigital number, since it uses as much as digits as its factorization.

1115552381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961118.

The product of its digits is 6000, while the sum is 32.

The square root of 1115552381 is about 33399.8859429190. The cubic root of 1115552381 is about 1037.1223398467.

It can be divided in two parts, 11155 and 52381, that added together give a palindrome (63536).

The spelling of 1115552381 in words is "one billion, one hundred fifteen million, five hundred fifty-two thousand, three hundred eighty-one".