1155530431 has 4 divisors (see below), whose sum is σ = 1260578664. Its totient is φ = 1050482200.

The previous prime is 1155530423. The next prime is 1155530437. The reversal of 1155530431 is 1340355511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1155530431 - 2³ = 1155530423 is a prime.

It is a super-2 number, since 2×1155530431² = 2670501153934091522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155530431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155530437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52524100 + ... + 52524121.

It is an arithmetic number, because the mean of its divisors is an integer number (315144666).

Almost surely, 2^1155530431 is an apocalyptic number.

1155530431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1155530431 is a deficient number, since it is larger than the sum of its proper divisors (105048233).

1155530431 is a wasteful number, since it uses less digits than its factorization.

1155530431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105048232.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1155530431 is about 33993.0938721382. The cubic root of 1155530431 is about 1049.3663390618.

Adding to 1155530431 its reverse (1340355511), we get a palindrome (2495885942).

The spelling of 1155530431 in words is "one billion, one hundred fifty-five million, five hundred thirty thousand, four hundred thirty-one".