1231033513 has 4 divisors (see below), whose sum is σ = 1231148548. Its totient is φ = 1230918480.

The previous prime is 1231033511. The next prime is 1231033523. The reversal of 1231033513 is 3153301321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467727129 + 763306384 = 21627^2 + 27628^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231033513 - 2¹ = 1231033511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231033511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39606 + ... + 63487.

It is an arithmetic number, because the mean of its divisors is an integer number (307787137).

Almost surely, 2^1231033513 is an apocalyptic number.

It is an amenable number.

1231033513 is a deficient number, since it is larger than the sum of its proper divisors (115035).

1231033513 is a wasteful number, since it uses less digits than its factorization.

1231033513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115034.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 1231033513 is about 35086.0871714131. The cubic root of 1231033513 is about 1071.7412801174.

Adding to 1231033513 its reverse (3153301321), we get a palindrome (4384334834).

The spelling of 1231033513 in words is "one billion, two hundred thirty-one million, thirty-three thousand, five hundred thirteen".