78505351 has 2 divisors, whose sum is σ = 78505352. Its totient is φ = 78505350.

The previous prime is 78505333. The next prime is 78505363. The reversal of 78505351 is 15350587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78505351 - 2⁵ = 78505319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78505391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39252675 + 39252676.

It is an arithmetic number, because the mean of its divisors is an integer number (39252676).

Almost surely, 2^78505351 is an apocalyptic number.

78505351 is a deficient number, since it is larger than the sum of its proper divisors (1).

78505351 is an equidigital number, since it uses as much as digits as its factorization.

78505351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 78505351 is about 8860.3245425887. The cubic root of 78505351 is about 428.1866143301.

The spelling of 78505351 in words is "seventy-eight million, five hundred five thousand, three hundred fifty-one".