1520994389 has 2 divisors, whose sum is σ = 1520994390. Its totient is φ = 1520994388.

The previous prime is 1520994379. The next prime is 1520994421. The reversal of 1520994389 is 9834990251.

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., 1318416100 + 202578289 = 36310^2 + 14233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520994389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1520994329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760497194 + 760497195.

It is an arithmetic number, because the mean of its divisors is an integer number (760497195).

Almost surely, 2^1520994389 is an apocalyptic number.

It is an amenable number.

1520994389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520994389 is an equidigital number, since it uses as much as digits as its factorization.

1520994389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 1520994389 is about 38999.9280640362. The cubic root of 1520994389 is about 1150.0300909581.

The spelling of 1520994389 in words is "one billion, five hundred twenty million, nine hundred ninety-four thousand, three hundred eighty-nine".