1131553 has 2 divisors, whose sum is σ = 1131554. Its totient is φ = 1131552.

The previous prime is 1131547. The next prime is 1131569. The reversal of 1131553 is 3551311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096209 + 35344 = 1047^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131553 - 2¹³ = 1123361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1131553.

It is not a weakly prime, because it can be changed into another prime (1131523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565776 + 565777.

It is an arithmetic number, because the mean of its divisors is an integer number (565777).

2^1131553 is an apocalyptic number.

It is an amenable number.

1131553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131553 is an equidigital number, since it uses as much as digits as its factorization.

1131553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225, while the sum is 19.

The square root of 1131553 is about 1063.7448002223. The cubic root of 1131553 is about 104.2057379476.

Adding to 1131553 its reverse (3551311), we get a palindrome (4682864).

The spelling of 1131553 in words is "one million, one hundred thirty-one thousand, five hundred fifty-three".