1231354513 has 4 divisors (see below), whose sum is σ = 1232139888. Its totient is φ = 1230569140.

The previous prime is 1231354507. The next prime is 1231354567. The reversal of 1231354513 is 3154531321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3154531321 = 1511 ⋅2087711.

It is a cyclic number.

It is not a de Polignac number, because 1231354513 - 2⁹ = 1231354001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231354573) 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, 390331 + ... + 393472.

It is an arithmetic number, because the mean of its divisors is an integer number (308034972).

Almost surely, 2^1231354513 is an apocalyptic number.

It is an amenable number.

1231354513 is a deficient number, since it is larger than the sum of its proper divisors (785375).

1231354513 is an equidigital number, since it uses as much as digits as its factorization.

1231354513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785374.

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

The square root of 1231354513 is about 35090.6613360307. The cubic root of 1231354513 is about 1071.8344265262.

Adding to 1231354513 its reverse (3154531321), we get a palindrome (4385885834).

The spelling of 1231354513 in words is "one billion, two hundred thirty-one million, three hundred fifty-four thousand, five hundred thirteen".