78348251 has 2 divisors, whose sum is σ = 78348252. Its totient is φ = 78348250.

The previous prime is 78348247. The next prime is 78348269. The reversal of 78348251 is 15284387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78348251 - 2² = 78348247 is a prime.

It is a super-2 number, since 2×78348251² = 12276896869518002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78398251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39174125 + 39174126.

It is an arithmetic number, because the mean of its divisors is an integer number (39174126).

Almost surely, 2^78348251 is an apocalyptic number.

78348251 is a deficient number, since it is larger than the sum of its proper divisors (1).

78348251 is an equidigital number, since it uses as much as digits as its factorization.

78348251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 38.

The square root of 78348251 is about 8851.4547391940. The cubic root of 78348251 is about 427.9008035026.

The spelling of 78348251 in words is "seventy-eight million, three hundred forty-eight thousand, two hundred fifty-one".