1331011321 has 2 divisors, whose sum is σ = 1331011322. Its totient is φ = 1331011320.

The previous prime is 1331011273. The next prime is 1331011327. The reversal of 1331011321 is 1231101331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184116921 + 146894400 = 34411^2 + 12120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331011321 is a prime.

It is a super-2 number, since 2×1331011321² = 3543182273260330082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1331011295 and 1331011304.

It is not a weakly prime, because it can be changed into another prime (1331011327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665505660 + 665505661.

It is an arithmetic number, because the mean of its divisors is an integer number (665505661).

Almost surely, 2^1331011321 is an apocalyptic number.

It is an amenable number.

1331011321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331011321 is an equidigital number, since it uses as much as digits as its factorization.

1331011321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1331011321 is about 36483.0278485764. The cubic root of 1331011321 is about 1100.0031187239.

Adding to 1331011321 its reverse (1231101331), we get a palindrome (2562112652).

The spelling of 1331011321 in words is "one billion, three hundred thirty-one million, eleven thousand, three hundred twenty-one".