1131220331 has 8 divisors (see below), whose sum is σ = 1135730400. Its totient is φ = 1126718208.

The previous prime is 1131220303. The next prime is 1131220333. The reversal of 1131220331 is 1330221311.

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 1131220331 - 2¹⁰ = 1131219307 is a prime.

It is a super-2 number, since 2×1131220331² = 2559318874535499122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131220333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559835 + ... + 561851.

It is an arithmetic number, because the mean of its divisors is an integer number (141966300).

Almost surely, 2^1131220331 is an apocalyptic number.

1131220331 is a deficient number, since it is larger than the sum of its proper divisors (4510069).

1131220331 is a wasteful number, since it uses less digits than its factorization.

1131220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1131220331 is about 33633.6190589119. The cubic root of 1131220331 is about 1041.9552501710.

Adding to 1131220331 its reverse (1330221311), we get a palindrome (2461441642).

The spelling of 1131220331 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, three hundred thirty-one".