77995009 has 2 divisors, whose sum is σ = 77995010. Its totient is φ = 77995008.

The previous prime is 77995003. The next prime is 77995013. The reversal of 77995009 is 90059977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 8105409 = 8360^2 + 2847^2 .

It is a cyclic number.

It is not a de Polignac number, because 77995009 - 2¹¹ = 77992961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77995009.

It is not a weakly prime, because it can be changed into another prime (77995003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38997504 + 38997505.

It is an arithmetic number, because the mean of its divisors is an integer number (38997505).

Almost surely, 2^77995009 is an apocalyptic number.

It is an amenable number.

77995009 is a deficient number, since it is larger than the sum of its proper divisors (1).

77995009 is an equidigital number, since it uses as much as digits as its factorization.

77995009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 178605, while the sum is 46.

The square root of 77995009 is about 8831.4783020738. The cubic root of 77995009 is about 427.2567547961.

The spelling of 77995009 in words is "seventy-seven million, nine hundred ninety-five thousand, nine".