1131271245 has 32 divisors (see below), whose sum is σ = 2165856000. Its totient is φ = 556932672.

The previous prime is 1131271223. The next prime is 1131271249. The reversal of 1131271245 is 5421721311.

It is not a de Polignac number, because 1131271245 - 2⁶ = 1131271181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131271249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320545 + ... + 324054.

It is an arithmetic number, because the mean of its divisors is an integer number (67683000).

Almost surely, 2^1131271245 is an apocalyptic number.

1131271245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131271245 is a deficient number, since it is larger than the sum of its proper divisors (1034584755).

1131271245 is a wasteful number, since it uses less digits than its factorization.

1131271245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644626 (or 644620 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1131271245 is about 33634.3759418842. The cubic root of 1131271245 is about 1041.9708820547.

Adding to 1131271245 its reverse (5421721311), we get a palindrome (6552992556).

The spelling of 1131271245 in words is "one billion, one hundred thirty-one million, two hundred seventy-one thousand, two hundred forty-five".