78080591 has 2 divisors, whose sum is σ = 78080592. Its totient is φ = 78080590.

The previous prime is 78080573. The next prime is 78080603. The reversal of 78080591 is 19508087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78080591 - 2¹⁰ = 78079567 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_4563992 and since 78080591 and 4563992 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78080521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39040295 + 39040296.

It is an arithmetic number, because the mean of its divisors is an integer number (39040296).

Almost surely, 2^78080591 is an apocalyptic number.

78080591 is a deficient number, since it is larger than the sum of its proper divisors (1).

78080591 is an equidigital number, since it uses as much as digits as its factorization.

78080591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 78080591 is about 8836.3222553277. The cubic root of 78080591 is about 427.4129704398.

The spelling of 78080591 in words is "seventy-eight million, eighty thousand, five hundred ninety-one".