1231303133 has 4 divisors (see below), whose sum is σ = 1257501120. Its totient is φ = 1205105148.

The previous prime is 1231303127. The next prime is 1231303169. The reversal of 1231303133 is 3313031321.

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: 3313031321 = 12703 ⋅260807.

It is a cyclic number.

It is not a de Polignac number, because 1231303133 - 2⁶ = 1231303069 is a prime.

It is a super-2 number, since 2×1231303133² = 3032214810671231378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231303123) 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, 13098923 + ... + 13099016.

It is an arithmetic number, because the mean of its divisors is an integer number (314375280).

Almost surely, 2^1231303133 is an apocalyptic number.

It is an amenable number.

1231303133 is a deficient number, since it is larger than the sum of its proper divisors (26197987).

1231303133 is an equidigital number, since it uses as much as digits as its factorization.

1231303133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26197986.

The product of its (nonzero) digits is 486, while the sum is 20.

The square root of 1231303133 is about 35089.9292247790. The cubic root of 1231303133 is about 1071.8195183855.

Adding to 1231303133 its reverse (3313031321), we get a palindrome (4544334454).

The spelling of 1231303133 in words is "one billion, two hundred thirty-one million, three hundred three thousand, one hundred thirty-three".