1520135989 has 2 divisors, whose sum is σ = 1520135990. Its totient is φ = 1520135988.

The previous prime is 1520135977. The next prime is 1520136011. The reversal of 1520135989 is 9895310251.

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., 1143116100 + 377019889 = 33810^2 + 19417^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520135989 - 2¹³ = 1520127797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1520135959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760067994 + 760067995.

It is an arithmetic number, because the mean of its divisors is an integer number (760067995).

Almost surely, 2^1520135989 is an apocalyptic number.

It is an amenable number.

1520135989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520135989 is an equidigital number, since it uses as much as digits as its factorization.

1520135989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 1520135989 is about 38988.9213623563. The cubic root of 1520135989 is about 1149.8137036596.

The spelling of 1520135989 in words is "one billion, five hundred twenty million, one hundred thirty-five thousand, nine hundred eighty-nine".