78523351 has 2 divisors, whose sum is σ = 78523352. Its totient is φ = 78523350.

The previous prime is 78523339. The next prime is 78523433. The reversal of 78523351 is 15332587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78523351 - 2¹⁹ = 77999063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78524351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39261675 + 39261676.

It is an arithmetic number, because the mean of its divisors is an integer number (39261676).

Almost surely, 2^78523351 is an apocalyptic number.

78523351 is a deficient number, since it is larger than the sum of its proper divisors (1).

78523351 is an equidigital number, since it uses as much as digits as its factorization.

78523351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 78523351 is about 8861.3402485177. The cubic root of 78523351 is about 428.2193372378.

The spelling of 78523351 in words is "seventy-eight million, five hundred twenty-three thousand, three hundred fifty-one".