78615001 has 2 divisors, whose sum is σ = 78615002. Its totient is φ = 78615000.

The previous prime is 78614993. The next prime is 78615037. The reversal of 78615001 is 10051687.

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., 39677401 + 38937600 = 6299^2 + 6240^2 .

It is a cyclic number.

It is not a de Polignac number, because 78615001 - 2³ = 78614993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78615041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39307500 + 39307501.

It is an arithmetic number, because the mean of its divisors is an integer number (39307501).

Almost surely, 2^78615001 is an apocalyptic number.

It is an amenable number.

78615001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78615001 is an equidigital number, since it uses as much as digits as its factorization.

78615001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 78615001 is about 8866.5100800710. The cubic root of 78615001 is about 428.3858738694.

Adding to 78615001 its reverse (10051687), we get a palindrome (88666688).

The spelling of 78615001 in words is "seventy-eight million, six hundred fifteen thousand, one".