787138489 has 2 divisors, whose sum is σ = 787138490. Its totient is φ = 787138488.

The previous prime is 787138477. The next prime is 787138493. The reversal of 787138489 is 984831787.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 751198464 + 35940025 = 27408^2 + 5995^2 .

It is a cyclic number.

It is not a de Polignac number, because 787138489 - 2¹³ = 787130297 is a prime.

It is not a weakly prime, because it can be changed into another prime (787138189) 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, 393569244 + 393569245.

It is an arithmetic number, because the mean of its divisors is an integer number (393569245).

Almost surely, 2^787138489 is an apocalyptic number.

It is an amenable number.

787138489 is a deficient number, since it is larger than the sum of its proper divisors (1).

787138489 is an equidigital number, since it uses as much as digits as its factorization.

787138489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 55.

The square root of 787138489 is about 28055.9884694872. The cubic root of 787138489 is about 923.3160456592.

It can be divided in two parts, 7871 and 38489, that added together give a triangular number (46360 = T₃₀₄).

The spelling of 787138489 in words is "seven hundred eighty-seven million, one hundred thirty-eight thousand, four hundred eighty-nine".