78846121 has 2 divisors, whose sum is σ = 78846122. Its totient is φ = 78846120.

The previous prime is 78846109. The next prime is 78846151. The reversal of 78846121 is 12164887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78570496 + 275625 = 8864^2 + 525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78846121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78846101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39423060 + 39423061.

It is an arithmetic number, because the mean of its divisors is an integer number (39423061).

Almost surely, 2^78846121 is an apocalyptic number.

It is an amenable number.

78846121 is a deficient number, since it is larger than the sum of its proper divisors (1).

78846121 is an equidigital number, since it uses as much as digits as its factorization.

78846121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 78846121 is about 8879.5338278538. The cubic root of 78846121 is about 428.8052665854.

The spelling of 78846121 in words is "seventy-eight million, eight hundred forty-six thousand, one hundred twenty-one".