1131243265 has 8 divisors (see below), whose sum is σ = 1374675840. Its totient is φ = 893538672.

The previous prime is 1131243263. The next prime is 1131243277. The reversal of 1131243265 is 5623421311.

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 1131243265 - 2¹ = 1131243263 is a prime.

It is a super-2 number, since 2×1131243265² = 2559422649215720450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131243263) 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, 1431559 + ... + 1432348.

It is an arithmetic number, because the mean of its divisors is an integer number (171834480).

Almost surely, 2^1131243265 is an apocalyptic number.

It is an amenable number.

1131243265 is a deficient number, since it is larger than the sum of its proper divisors (243432575).

1131243265 is an equidigital number, since it uses as much as digits as its factorization.

1131243265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863991.

The product of its digits is 4320, while the sum is 28.

The square root of 1131243265 is about 33633.9599958138. The cubic root of 1131243265 is about 1041.9622915462.

Adding to 1131243265 its reverse (5623421311), we get a palindrome (6754664576).

The spelling of 1131243265 in words is "one billion, one hundred thirty-one million, two hundred forty-three thousand, two hundred sixty-five".