1155632321 has 4 divisors (see below), whose sum is σ = 1161682944. Its totient is φ = 1149581700.

The previous prime is 1155632311. The next prime is 1155632327. The reversal of 1155632321 is 1232365511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155632321 is a prime.

It is a super-2 number, since 2×1155632321² = 2670972122679694082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155632327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3025025 + ... + 3025406.

It is an arithmetic number, because the mean of its divisors is an integer number (290420736).

Almost surely, 2^1155632321 is an apocalyptic number.

It is an amenable number.

1155632321 is a deficient number, since it is larger than the sum of its proper divisors (6050623).

1155632321 is an equidigital number, since it uses as much as digits as its factorization.

1155632321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6050622.

The product of its digits is 5400, while the sum is 29.

The square root of 1155632321 is about 33994.5925258709. The cubic root of 1155632321 is about 1049.3971811152.

Adding to 1155632321 its reverse (1232365511), we get a palindrome (2387997832).

The spelling of 1155632321 in words is "one billion, one hundred fifty-five million, six hundred thirty-two thousand, three hundred twenty-one".