78522161 has 8 divisors (see below), whose sum is σ = 82028160. Its totient is φ = 75023872.

The previous prime is 78522151. The next prime is 78522181. The reversal of 78522161 is 16122587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78522161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78522131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31196 + ... + 33618.

It is an arithmetic number, because the mean of its divisors is an integer number (10253520).

Almost surely, 2^78522161 is an apocalyptic number.

It is an amenable number.

78522161 is a deficient number, since it is larger than the sum of its proper divisors (3505999).

78522161 is a wasteful number, since it uses less digits than its factorization.

78522161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855.

The product of its digits is 6720, while the sum is 32.

The square root of 78522161 is about 8861.2731026642. The cubic root of 78522161 is about 428.2171740444.

The spelling of 78522161 in words is "seventy-eight million, five hundred twenty-two thousand, one hundred sixty-one".