1318533421 has 2 divisors, whose sum is σ = 1318533422. Its totient is φ = 1318533420.

The previous prime is 1318533409. The next prime is 1318533439. The reversal of 1318533421 is 1243358131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687016521 + 631516900 = 26211^2 + 25130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318533421 - 2¹⁵ = 1318500653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318533521) 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 as a sum of consecutive naturals, namely, 659266710 + 659266711.

It is an arithmetic number, because the mean of its divisors is an integer number (659266711).

Almost surely, 2^1318533421 is an apocalyptic number.

It is an amenable number.

1318533421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318533421 is an equidigital number, since it uses as much as digits as its factorization.

1318533421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 1318533421 is about 36311.6155107426. The cubic root of 1318533421 is about 1096.5549022545.

The spelling of 1318533421 in words is "one billion, three hundred eighteen million, five hundred thirty-three thousand, four hundred twenty-one".