78906251 has 2 divisors, whose sum is σ = 78906252. Its totient is φ = 78906250.

The previous prime is 78906203. The next prime is 78906271. The reversal of 78906251 is 15260987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78906251 - 2²² = 74711947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78906271) 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, 39453125 + 39453126.

It is an arithmetic number, because the mean of its divisors is an integer number (39453126).

Almost surely, 2^78906251 is an apocalyptic number.

78906251 is a deficient number, since it is larger than the sum of its proper divisors (1).

78906251 is an equidigital number, since it uses as much as digits as its factorization.

78906251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 78906251 is about 8882.9190585077. The cubic root of 78906251 is about 428.9142447173.

It can be divided in two parts, 7890 and 6251, that added together give a palindrome (14141).

The spelling of 78906251 in words is "seventy-eight million, nine hundred six thousand, two hundred fifty-one".