1331511421 has 4 divisors (see below), whose sum is σ = 1356634332. Its totient is φ = 1306388512.

The previous prime is 1331511413. The next prime is 1331511437. The reversal of 1331511421 is 1241151331.

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 544708921 + 786802500 = 23339^2 + 28050^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331511421 - 2³ = 1331511413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331511392 and 1331511401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331511221) 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, 12561376 + ... + 12561481.

It is an arithmetic number, because the mean of its divisors is an integer number (339158583).

Almost surely, 2^1331511421 is an apocalyptic number.

It is an amenable number.

1331511421 is a deficient number, since it is larger than the sum of its proper divisors (25122911).

1331511421 is an equidigital number, since it uses as much as digits as its factorization.

1331511421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25122910.

The product of its digits is 360, while the sum is 22.

The square root of 1331511421 is about 36489.8810768136. The cubic root of 1331511421 is about 1100.1408692869.

Adding to 1331511421 its reverse (1241151331), we get a palindrome (2572662752).

The spelling of 1331511421 in words is "one billion, three hundred thirty-one million, five hundred eleven thousand, four hundred twenty-one".