1231355413 has 8 divisors (see below), whose sum is σ = 1273317408. Its totient is φ = 1190087184.

The previous prime is 1231355387. The next prime is 1231355431. The reversal of 1231355413 is 3145531321.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1231355413 - 2²⁹ = 694484501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231355473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169831 + ... + 176932.

It is an arithmetic number, because the mean of its divisors is an integer number (159164676).

Almost surely, 2^1231355413 is an apocalyptic number.

It is an amenable number.

1231355413 is a deficient number, since it is larger than the sum of its proper divisors (41961995).

1231355413 is an equidigital number, since it uses as much as digits as its factorization.

1231355413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346883.

The product of its digits is 5400, while the sum is 28.

The square root of 1231355413 is about 35090.6741599531. The cubic root of 1231355413 is about 1071.8346876616.

Adding to 1231355413 its reverse (3145531321), we get a palindrome (4376886734).

The spelling of 1231355413 in words is "one billion, two hundred thirty-one million, three hundred fifty-five thousand, four hundred thirteen".