78393541 has 2 divisors, whose sum is σ = 78393542. Its totient is φ = 78393540.

The previous prime is 78393533. The next prime is 78393569. The reversal of 78393541 is 14539387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78393316 + 225 = 8854^2 + 15^2 .

It is an emirp because it is prime and its reverse (14539387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78393541 - 2³ = 78393533 is a prime.

It is a super-2 number, since 2×78393541² = 12291094541037362, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78393494 and 78393503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78393521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39196770 + 39196771.

It is an arithmetic number, because the mean of its divisors is an integer number (39196771).

Almost surely, 2^78393541 is an apocalyptic number.

It is an amenable number.

78393541 is a deficient number, since it is larger than the sum of its proper divisors (1).

78393541 is an equidigital number, since it uses as much as digits as its factorization.

78393541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 78393541 is about 8854.0127061124. The cubic root of 78393541 is about 427.9832384183.

The spelling of 78393541 in words is "seventy-eight million, three hundred ninety-three thousand, five hundred forty-one".