1115721461 has 4 divisors (see below), whose sum is σ = 1122170892. Its totient is φ = 1109272032.

The previous prime is 1115721457. The next prime is 1115721463. The reversal of 1115721461 is 1641275111.

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 717918436 + 397803025 = 26794^2 + 19945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115721461 - 2² = 1115721457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115721463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3224456 + ... + 3224801.

It is an arithmetic number, because the mean of its divisors is an integer number (280542723).

Almost surely, 2^1115721461 is an apocalyptic number.

It is an amenable number.

1115721461 is a deficient number, since it is larger than the sum of its proper divisors (6449431).

1115721461 is an equidigital number, since it uses as much as digits as its factorization.

1115721461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6449430.

The product of its digits is 1680, while the sum is 29.

The square root of 1115721461 is about 33402.4169933854. The cubic root of 1115721461 is about 1037.1747347527.

Adding to 1115721461 its reverse (1641275111), we get a palindrome (2756996572).

The spelling of 1115721461 in words is "one billion, one hundred fifteen million, seven hundred twenty-one thousand, four hundred sixty-one".