1131267721 has 8 divisors (see below), whose sum is σ = 1135067904. Its totient is φ = 1127475120.

The previous prime is 1131267713. The next prime is 1131267751. The reversal of 1131267721 is 1277621311.

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 1131267721 - 2³ = 1131267713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131267751) 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, 468006 + ... + 470416.

It is an arithmetic number, because the mean of its divisors is an integer number (141883488).

Almost surely, 2^1131267721 is an apocalyptic number.

It is an amenable number.

1131267721 is a deficient number, since it is larger than the sum of its proper divisors (3800183).

1131267721 is an equidigital number, since it uses as much as digits as its factorization.

1131267721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3791.

The product of its digits is 3528, while the sum is 31.

The square root of 1131267721 is about 33634.3235549639. The cubic root of 1131267721 is about 1041.9698001128.

The spelling of 1131267721 in words is "one billion, one hundred thirty-one million, two hundred sixty-seven thousand, seven hundred twenty-one".