78118361 has 2 divisors, whose sum is σ = 78118362. Its totient is φ = 78118360.

The previous prime is 78118309. The next prime is 78118379. The reversal of 78118361 is 16381187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55413136 + 22705225 = 7444^2 + 4765^2 .

It is a cyclic number.

It is not a de Polignac number, because 78118361 - 2¹⁴ = 78101977 is a prime.

It is a super-2 number, since 2×78118361² = 12204956650652642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78118561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39059180 + 39059181.

It is an arithmetic number, because the mean of its divisors is an integer number (39059181).

Almost surely, 2^78118361 is an apocalyptic number.

It is an amenable number.

78118361 is a deficient number, since it is larger than the sum of its proper divisors (1).

78118361 is an equidigital number, since it uses as much as digits as its factorization.

78118361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 78118361 is about 8838.4591982992. The cubic root of 78118361 is about 427.4818769605.

The spelling of 78118361 in words is "seventy-eight million, one hundred eighteen thousand, three hundred sixty-one".