78127061 has 2 divisors, whose sum is σ = 78127062. Its totient is φ = 78127060.

The previous prime is 78127039. The next prime is 78127079. The reversal of 78127061 is 16072187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 24690961 = 7310^2 + 4969^2 .

It is an emirp because it is prime and its reverse (16072187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78127061 is a prime.

It is a super-2 number, since 2×78127061² = 12207675320995442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78127261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39063530 + 39063531.

It is an arithmetic number, because the mean of its divisors is an integer number (39063531).

Almost surely, 2^78127061 is an apocalyptic number.

It is an amenable number.

78127061 is a deficient number, since it is larger than the sum of its proper divisors (1).

78127061 is an equidigital number, since it uses as much as digits as its factorization.

78127061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 78127061 is about 8838.9513518290. The cubic root of 78127061 is about 427.4977458472.

The spelling of 78127061 in words is "seventy-eight million, one hundred twenty-seven thousand, sixty-one".