78163109 has 2 divisors, whose sum is σ = 78163110. Its totient is φ = 78163108.

The previous prime is 78163103. The next prime is 78163123. The reversal of 78163109 is 90136187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 13118884 = 8065^2 + 3622^2 .

It is an emirp because it is prime and its reverse (90136187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78163109 - 2²⁴ = 61385893 is a prime.

It is a super-2 number, since 2×78163109² = 12218943217091762, 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 (78163103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39081554 + 39081555.

It is an arithmetic number, because the mean of its divisors is an integer number (39081555).

Almost surely, 2^78163109 is an apocalyptic number.

It is an amenable number.

78163109 is a deficient number, since it is larger than the sum of its proper divisors (1).

78163109 is an equidigital number, since it uses as much as digits as its factorization.

78163109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 78163109 is about 8840.9902725882. The cubic root of 78163109 is about 427.5634852083.

The spelling of 78163109 in words is "seventy-eight million, one hundred sixty-three thousand, one hundred nine".