1211536042 has 8 divisors (see below), whose sum is σ = 1924204356. Its totient is φ = 570134592.

The previous prime is 1211536037. The next prime is 1211536043. The reversal of 1211536042 is 2406351121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1209578841 + 1957201 = 34779^2 + 1399^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1211535998 and 1211536016.

It is not an unprimeable number, because it can be changed into a prime (1211536043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17816673 + ... + 17816740.

Almost surely, 2^1211536042 is an apocalyptic number.

1211536042 is a deficient number, since it is larger than the sum of its proper divisors (712668314).

1211536042 is a wasteful number, since it uses less digits than its factorization.

1211536042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35633432.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1211536042 is about 34807.1263105704. The cubic root of 1211536042 is about 1066.0529578850.

Adding to 1211536042 its reverse (2406351121), we get a palindrome (3617887163).

The spelling of 1211536042 in words is "one billion, two hundred eleven million, five hundred thirty-six thousand, forty-two".