76989509 has 2 divisors, whose sum is σ = 76989510. Its totient is φ = 76989508.

The previous prime is 76989467. The next prime is 76989541. The reversal of 76989509 is 90598967.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 37173409 = 6310^2 + 6097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76989509 is a prime.

It is a super-2 number, since 2×76989509² = 11854768992122162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76989569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38494754 + 38494755.

It is an arithmetic number, because the mean of its divisors is an integer number (38494755).

Almost surely, 2^76989509 is an apocalyptic number.

It is an amenable number.

76989509 is a deficient number, since it is larger than the sum of its proper divisors (1).

76989509 is an equidigital number, since it uses as much as digits as its factorization.

76989509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 76989509 is about 8774.3665868255. The cubic root of 76989509 is about 425.4127643871.

The spelling of 76989509 in words is "seventy-six million, nine hundred eighty-nine thousand, five hundred nine".