78063121 has 2 divisors, whose sum is σ = 78063122. Its totient is φ = 78063120.

The previous prime is 78063119. The next prime is 78063131. The reversal of 78063121 is 12136087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49547521 + 28515600 = 7039^2 + 5340^2 .

It is a cyclic number.

It is not a de Polignac number, because 78063121 - 2¹ = 78063119 is a prime.

Together with 78063119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78063121.

It is not a weakly prime, because it can be changed into another prime (78063101) 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, 39031560 + 39031561.

It is an arithmetic number, because the mean of its divisors is an integer number (39031561).

Almost surely, 2^78063121 is an apocalyptic number.

It is an amenable number.

78063121 is a deficient number, since it is larger than the sum of its proper divisors (1).

78063121 is an equidigital number, since it uses as much as digits as its factorization.

78063121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 78063121 is about 8835.3336665912. Note that the first 3 decimals coincide. The cubic root of 78063121 is about 427.3810911492.

The spelling of 78063121 in words is "seventy-eight million, sixty-three thousand, one hundred twenty-one".