1131240553 has 8 divisors (see below), whose sum is σ = 1190153160. Its totient is φ = 1073819520.

The previous prime is 1131240541. The next prime is 1131240557. The reversal of 1131240553 is 3550421311.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 282508864 + 848731689 = 16808^2 + 29133^2 .

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

It is not a de Polignac number, because 1131240553 - 2⁵ = 1131240521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131240557) 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, 371338 + ... + 374371.

It is an arithmetic number, because the mean of its divisors is an integer number (148769145).

Almost surely, 2^1131240553 is an apocalyptic number.

It is an amenable number.

1131240553 is a deficient number, since it is larger than the sum of its proper divisors (58912607).

1131240553 is an equidigital number, since it uses as much as digits as its factorization.

1131240553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745787.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1131240553 is about 33633.9196793951. The cubic root of 1131240553 is about 1041.9614588918.

Adding to 1131240553 its reverse (3550421311), we get a palindrome (4681661864).

The spelling of 1131240553 in words is "one billion, one hundred thirty-one million, two hundred forty thousand, five hundred fifty-three".