78144541 has 2 divisors, whose sum is σ = 78144542. Its totient is φ = 78144540.

The previous prime is 78144533. The next prime is 78144551. The reversal of 78144541 is 14544187.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60124516 + 18020025 = 7754^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 78144541 - 2³ = 78144533 is a prime.

It is a super-2 number, since 2×78144541² = 12213138576201362, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78144497 and 78144506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78144551) 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, 39072270 + 39072271.

It is an arithmetic number, because the mean of its divisors is an integer number (39072271).

Almost surely, 2^78144541 is an apocalyptic number.

It is an amenable number.

78144541 is a deficient number, since it is larger than the sum of its proper divisors (1).

78144541 is an equidigital number, since it uses as much as digits as its factorization.

78144541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17920, while the sum is 34.

The square root of 78144541 is about 8839.9401016070. The cubic root of 78144541 is about 427.5296259806.

The spelling of 78144541 in words is "seventy-eight million, one hundred forty-four thousand, five hundred forty-one".