1231210535 has 4 divisors (see below), whose sum is σ = 1477452648. Its totient is φ = 984968424.

The previous prime is 1231210523. The next prime is 1231210537. The reversal of 1231210535 is 5350121321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5350121321 = 41759 ⋅128119.

It is a cyclic number.

It is not a de Polignac number, because 1231210535 - 2¹² = 1231206439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231210535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231210537) 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, 123121049 + ... + 123121058.

It is an arithmetic number, because the mean of its divisors is an integer number (369363162).

Almost surely, 2^1231210535 is an apocalyptic number.

1231210535 is a deficient number, since it is larger than the sum of its proper divisors (246242113).

1231210535 is an equidigital number, since it uses as much as digits as its factorization.

1231210535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246242112.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1231210535 is about 35088.6097615736. The cubic root of 1231210535 is about 1071.7926496075.

Adding to 1231210535 its reverse (5350121321), we get a palindrome (6581331856).

The spelling of 1231210535 in words is "one billion, two hundred thirty-one million, two hundred ten thousand, five hundred thirty-five".