78210953 has 2 divisors, whose sum is σ = 78210954. Its totient is φ = 78210952.

The previous prime is 78210929. The next prime is 78211019. The reversal of 78210953 is 35901287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65157184 + 13053769 = 8072^2 + 3613^2 .

It is a cyclic number.

It is not a de Polignac number, because 78210953 - 2¹² = 78206857 is a prime.

It is a super-2 number, since 2×78210953² = 12233906338336418, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78210053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39105476 + 39105477.

It is an arithmetic number, because the mean of its divisors is an integer number (39105477).

Almost surely, 2^78210953 is an apocalyptic number.

It is an amenable number.

78210953 is a deficient number, since it is larger than the sum of its proper divisors (1).

78210953 is an equidigital number, since it uses as much as digits as its factorization.

78210953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 78210953 is about 8843.6956641440. The cubic root of 78210953 is about 427.6507052761.

The spelling of 78210953 in words is "seventy-eight million, two hundred ten thousand, nine hundred fifty-three".