1131615221 has 8 divisors (see below), whose sum is σ = 1255413600. Its totient is φ = 1011304240.

The previous prime is 1131615161. The next prime is 1131615241. The reversal of 1131615221 is 1225161311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131615221 - 2³⁰ = 57873397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131615241) 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 in 7 ways as a sum of consecutive naturals, for example, 871166 + ... + 872463.

It is an arithmetic number, because the mean of its divisors is an integer number (156926700).

Almost surely, 2^1131615221 is an apocalyptic number.

1131615221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1131615221 is a deficient number, since it is larger than the sum of its proper divisors (123798379).

1131615221 is a wasteful number, since it uses less digits than its factorization.

1131615221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743699.

The product of its digits is 360, while the sum is 23.

The square root of 1131615221 is about 33639.4890121714. The cubic root of 1131615221 is about 1042.0764790861.

Adding to 1131615221 its reverse (1225161311), we get a palindrome (2356776532).

The spelling of 1131615221 in words is "one billion, one hundred thirty-one million, six hundred fifteen thousand, two hundred twenty-one".