1231324513 has 4 divisors (see below), whose sum is σ = 1252194480. Its totient is φ = 1210454548.

The previous prime is 1231324511. The next prime is 1231324531. The reversal of 1231324513 is 3154231321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231324513 - 2¹ = 1231324511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231324511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10434895 + ... + 10435012.

It is an arithmetic number, because the mean of its divisors is an integer number (313048620).

Almost surely, 2^1231324513 is an apocalyptic number.

It is an amenable number.

1231324513 is a deficient number, since it is larger than the sum of its proper divisors (20869967).

1231324513 is an equidigital number, since it uses as much as digits as its factorization.

1231324513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20869966.

The product of its digits is 2160, while the sum is 25.

The square root of 1231324513 is about 35090.2338692691. The cubic root of 1231324513 is about 1071.8257219402.

Adding to 1231324513 its reverse (3154231321), we get a palindrome (4385555834).

The spelling of 1231324513 in words is "one billion, two hundred thirty-one million, three hundred twenty-four thousand, five hundred thirteen".