78352501 has 2 divisors, whose sum is σ = 78352502. Its totient is φ = 78352500.

The previous prime is 78352471. The next prime is 78352537. The reversal of 78352501 is 10525387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69056100 + 9296401 = 8310^2 + 3049^2 .

It is an emirp because it is prime and its reverse (10525387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78352501 - 2⁹ = 78351989 is a prime.

It is a super-2 number, since 2×78352501² = 12278228825910002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78352591) 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 as a sum of consecutive naturals, namely, 39176250 + 39176251.

It is an arithmetic number, because the mean of its divisors is an integer number (39176251).

Almost surely, 2^78352501 is an apocalyptic number.

It is an amenable number.

78352501 is a deficient number, since it is larger than the sum of its proper divisors (1).

78352501 is an equidigital number, since it uses as much as digits as its factorization.

78352501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 78352501 is about 8851.6948094701. The cubic root of 78352501 is about 427.9085405209.

Adding to 78352501 its reverse (10525387), we get a palindrome (88877888).

The spelling of 78352501 in words is "seventy-eight million, three hundred fifty-two thousand, five hundred one".