1331020819 has 2 divisors, whose sum is σ = 1331020820. Its totient is φ = 1331020818.

The previous prime is 1331020759. The next prime is 1331020837. The reversal of 1331020819 is 9180201331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331020819 - 2²³ = 1322632211 is a prime.

It is a super-2 number, since 2×1331020819² = 3543232841222861522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1331030819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665510409 + 665510410.

It is an arithmetic number, because the mean of its divisors is an integer number (665510410).

Almost surely, 2^1331020819 is an apocalyptic number.

1331020819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331020819 is an equidigital number, since it uses as much as digits as its factorization.

1331020819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1331020819 is about 36483.1580184611. The cubic root of 1331020819 is about 1100.0057352318.

The spelling of 1331020819 in words is "one billion, three hundred thirty-one million, twenty thousand, eight hundred nineteen".