1331032121 has 4 divisors (see below), whose sum is σ = 1331535732. Its totient is φ = 1330528512.

The previous prime is 1331032097. The next prime is 1331032123. The reversal of 1331032121 is 1212301331.

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 398401600 + 932630521 = 19960^2 + 30539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331032121 - 2²⁶ = 1263923257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331032121.

It is not an unprimeable number, because it can be changed into a prime (1331032123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247820 + ... + 253133.

It is an arithmetic number, because the mean of its divisors is an integer number (332883933).

Almost surely, 2^1331032121 is an apocalyptic number.

It is an amenable number.

1331032121 is a deficient number, since it is larger than the sum of its proper divisors (503611).

1331032121 is an equidigital number, since it uses as much as digits as its factorization.

1331032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503610.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1331032121 is about 36483.3129115216. The cubic root of 1331032121 is about 1100.0088486891.

Adding to 1331032121 its reverse (1212301331), we get a palindrome (2543333452).

The spelling of 1331032121 in words is "one billion, three hundred thirty-one million, thirty-two thousand, one hundred twenty-one".