1231355052 has 36 divisors (see below), whose sum is σ = 3184981800. Its totient is φ = 400905792.

The previous prime is 1231355029. The next prime is 1231355053. The reversal of 1231355052 is 2505531321.

It is a happy number.

1231355052 is a `hidden beast` number, since 1 + 23 + 135 + 505 + 2 = 666.

1231355052 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1231355053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396177 + ... + 399272.

Almost surely, 2^1231355052 is an apocalyptic number.

1231355052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231355052 is an abundant number, since it is smaller than the sum of its proper divisors (1953626748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231355052 is a wasteful number, since it uses less digits than its factorization.

1231355052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795502 (or 795497 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 1231355052 is about 35090.6690161359. The cubic root of 1231355052 is about 1071.8345829173.

Adding to 1231355052 its reverse (2505531321), we get a palindrome (3736886373).

The spelling of 1231355052 in words is "one billion, two hundred thirty-one million, three hundred fifty-five thousand, fifty-two".