78895121 has 2 divisors, whose sum is σ = 78895122. Its totient is φ = 78895120.

The previous prime is 78895081. The next prime is 78895123. The reversal of 78895121 is 12159887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 13608721 = 8080^2 + 3689^2 .

It is a cyclic number.

It is not a de Polignac number, because 78895121 - 2⁶ = 78895057 is a prime.

Together with 78895123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78895123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39447560 + 39447561.

It is an arithmetic number, because the mean of its divisors is an integer number (39447561).

Almost surely, 2^78895121 is an apocalyptic number.

It is an amenable number.

78895121 is a deficient number, since it is larger than the sum of its proper divisors (1).

78895121 is an equidigital number, since it uses as much as digits as its factorization.

78895121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 78895121 is about 8882.2925531644. The cubic root of 78895121 is about 428.8940771558.

The spelling of 78895121 in words is "seventy-eight million, eight hundred ninety-five thousand, one hundred twenty-one".