1331963389 has 2 divisors, whose sum is σ = 1331963390. Its totient is φ = 1331963388.

The previous prime is 1331963371. The next prime is 1331963393. The reversal of 1331963389 is 9833691331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1023680025 + 308283364 = 31995^2 + 17558^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331963389 - 2⁷ = 1331963261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331963489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665981694 + 665981695.

It is an arithmetic number, because the mean of its divisors is an integer number (665981695).

Almost surely, 2^1331963389 is an apocalyptic number.

It is an amenable number.

1331963389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331963389 is an equidigital number, since it uses as much as digits as its factorization.

1331963389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 46.

The square root of 1331963389 is about 36496.0736107324. The cubic root of 1331963389 is about 1100.2653324124.

The spelling of 1331963389 in words is "one billion, three hundred thirty-one million, nine hundred sixty-three thousand, three hundred eighty-nine".