1154221131 has 8 divisors (see below), whose sum is σ = 1758813184. Its totient is φ = 659554920.

The previous prime is 1154221129. The next prime is 1154221151. The reversal of 1154221131 is 1311224511.

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

It is not a de Polignac number, because 1154221131 - 2¹ = 1154221129 is a prime.

It is a super-2 number, since 2×1154221131² = 2664452838493838322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 54962911 = 1154221131 / (1 + 1 + 5 + 4 + 2 + 2 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1154221098 and 1154221107.

It is not an unprimeable number, because it can be changed into a prime (1154221151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27481435 + ... + 27481476.

It is an arithmetic number, because the mean of its divisors is an integer number (219851648).

Almost surely, 2^1154221131 is an apocalyptic number.

1154221131 is a deficient number, since it is larger than the sum of its proper divisors (604592053).

1154221131 is an equidigital number, since it uses as much as digits as its factorization.

1154221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54962921.

The product of its digits is 240, while the sum is 21.

The square root of 1154221131 is about 33973.8300902327. The cubic root of 1154221131 is about 1048.9698531535.

Adding to 1154221131 its reverse (1311224511), we get a palindrome (2465445642).

The spelling of 1154221131 in words is "one billion, one hundred fifty-four million, two hundred twenty-one thousand, one hundred thirty-one".