78653251 has 2 divisors, whose sum is σ = 78653252. Its totient is φ = 78653250.

The previous prime is 78653233. The next prime is 78653257. The reversal of 78653251 is 15235687.

It is a strong prime.

It is an emirp because it is prime and its reverse (15235687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78653251 - 2¹⁵ = 78620483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78653251.

It is not a weakly prime, because it can be changed into another prime (78653257) 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, 39326625 + 39326626.

It is an arithmetic number, because the mean of its divisors is an integer number (39326626).

Almost surely, 2^78653251 is an apocalyptic number.

78653251 is a deficient number, since it is larger than the sum of its proper divisors (1).

78653251 is an equidigital number, since it uses as much as digits as its factorization.

78653251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 78653251 is about 8868.6668107444. Note that the first 3 decimals coincide. The cubic root of 78653251 is about 428.4553394197.

The spelling of 78653251 in words is "seventy-eight million, six hundred fifty-three thousand, two hundred fifty-one".