1115021645 has 4 divisors (see below), whose sum is σ = 1338025980. Its totient is φ = 892017312.

The previous prime is 1115021639. The next prime is 1115021647. The reversal of 1115021645 is 5461205111.

1115021645 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5461205111 = 44953 ⋅121487.

It can be written as a sum of positive squares in 2 ways, for example, as 697963561 + 417058084 = 26419^2 + 20422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115021645 - 2⁴ = 1115021629 is a prime.

It is a super-3 number, since 3×1115021645³ (a number of 28 digits) contains 333 as substring.

1115021645 is a modest number, since divided by 21645 gives 1115 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115021647) 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, 111502160 + ... + 111502169.

It is an arithmetic number, because the mean of its divisors is an integer number (334506495).

Almost surely, 2^1115021645 is an apocalyptic number.

It is an amenable number.

1115021645 is a deficient number, since it is larger than the sum of its proper divisors (223004335).

1115021645 is an equidigital number, since it uses as much as digits as its factorization.

1115021645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223004334.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1115021645 is about 33391.9398208610. The cubic root of 1115021645 is about 1036.9578397339.

Adding to 1115021645 its reverse (5461205111), we get a palindrome (6576226756).

The spelling of 1115021645 in words is "one billion, one hundred fifteen million, twenty-one thousand, six hundred forty-five".