1331123047 has 4 divisors (see below), whose sum is σ = 1333338496. Its totient is φ = 1328907600.

The previous prime is 1331123039. The next prime is 1331123077. The reversal of 1331123047 is 7403211331.

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

It is a cyclic number.

It is not a de Polignac number, because 1331123047 - 2³ = 1331123039 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 (1331123077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1106823 + ... + 1108024.

It is an arithmetic number, because the mean of its divisors is an integer number (333334624).

Almost surely, 2^1331123047 is an apocalyptic number.

1331123047 is a deficient number, since it is larger than the sum of its proper divisors (2215449).

1331123047 is an equidigital number, since it uses as much as digits as its factorization.

1331123047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215448.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 1331123047 is about 36484.5590215916. The cubic root of 1331123047 is about 1100.0338962007.

Adding to 1331123047 its reverse (7403211331), we get a palindrome (8734334378).

The spelling of 1331123047 in words is "one billion, three hundred thirty-one million, one hundred twenty-three thousand, forty-seven".