1231135522 has 4 divisors (see below), whose sum is σ = 1846703286. Its totient is φ = 615567760.

The previous prime is 1231135517. The next prime is 1231135547. The reversal of 1231135522 is 2255311321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2255311321 = 67 ⋅33661363.

It can be written as a sum of positive squares in only one way, i.e., 1083002281 + 148133241 = 32909^2 + 12171^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307783879 + ... + 307783882.

Almost surely, 2^1231135522 is an apocalyptic number.

1231135522 is a deficient number, since it is larger than the sum of its proper divisors (615567764).

1231135522 is an equidigital number, since it uses as much as digits as its factorization.

1231135522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615567763.

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

The square root of 1231135522 is about 35087.5408371690. The cubic root of 1231135522 is about 1071.7708824083.

Adding to 1231135522 its reverse (2255311321), we get a palindrome (3486446843).

The spelling of 1231135522 in words is "one billion, two hundred thirty-one million, one hundred thirty-five thousand, five hundred twenty-two".