78123061 has 2 divisors, whose sum is σ = 78123062. Its totient is φ = 78123060.

The previous prime is 78123053. The next prime is 78123077. The reversal of 78123061 is 16032187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68574961 + 9548100 = 8281^2 + 3090^2 .

It is a cyclic number.

It is not a de Polignac number, because 78123061 - 2³ = 78123053 is a prime.

It is a super-2 number, since 2×78123061² = 12206425320019442, 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 (78127061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39061530 + 39061531.

It is an arithmetic number, because the mean of its divisors is an integer number (39061531).

Almost surely, 2^78123061 is an apocalyptic number.

It is an amenable number.

78123061 is a deficient number, since it is larger than the sum of its proper divisors (1).

78123061 is an equidigital number, since it uses as much as digits as its factorization.

78123061 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 78123061 is about 8838.7250777474. The cubic root of 78123061 is about 427.4904499537.

The spelling of 78123061 in words is "seventy-eight million, one hundred twenty-three thousand, sixty-one".