78018541 has 4 divisors (see below), whose sum is σ = 82124800. Its totient is φ = 73912284.

The previous prime is 78018517. The next prime is 78018569. The reversal of 78018541 is 14581087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14581087 = 17 ⋅857711.

It is a cyclic number.

It is not a de Polignac number, because 78018541 - 2⁵ = 78018509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78018497 and 78018506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78018511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053101 + ... + 2053138.

It is an arithmetic number, because the mean of its divisors is an integer number (20531200).

Almost surely, 2^78018541 is an apocalyptic number.

It is an amenable number.

78018541 is a deficient number, since it is larger than the sum of its proper divisors (4106259).

78018541 is a wasteful number, since it uses less digits than its factorization.

78018541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106258.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 78018541 is about 8832.8104813813. The cubic root of 78018541 is about 427.2997199170.

It can be divided in two parts, 780 and 18541, that added together give a square (19321 = 139²).

The spelling of 78018541 in words is "seventy-eight million, eighteen thousand, five hundred forty-one".