1331156323 has 4 divisors (see below), whose sum is σ = 1521321520. Its totient is φ = 1140991128.

The previous prime is 1331156279. The next prime is 1331156329. The reversal of 1331156323 is 3236511331.

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 1331156323 - 2¹³ = 1331148131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331156291 and 1331156300.

It is not an unprimeable number, because it can be changed into a prime (1331156329) 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, 95082588 + ... + 95082601.

It is an arithmetic number, because the mean of its divisors is an integer number (380330380).

Almost surely, 2^1331156323 is an apocalyptic number.

1331156323 is a deficient number, since it is larger than the sum of its proper divisors (190165197).

1331156323 is an equidigital number, since it uses as much as digits as its factorization.

1331156323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190165196.

The product of its digits is 4860, while the sum is 28.

The square root of 1331156323 is about 36485.0150472766. The cubic root of 1331156323 is about 1100.0430625015.

Adding to 1331156323 its reverse (3236511331), we get a palindrome (4567667654).

The spelling of 1331156323 in words is "one billion, three hundred thirty-one million, one hundred fifty-six thousand, three hundred twenty-three".