78115001 has 2 divisors, whose sum is σ = 78115002. Its totient is φ = 78115000.

The previous prime is 78114941. The next prime is 78115019. The reversal of 78115001 is 10051187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68873401 + 9241600 = 8299^2 + 3040^2 .

It is an emirp because it is prime and its reverse (10051187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78115001 - 2¹⁸ = 77852857 is a prime.

It is a super-2 number, since 2×78115001² = 12203906762460002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78115021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39057500 + 39057501.

It is an arithmetic number, because the mean of its divisors is an integer number (39057501).

Almost surely, 2^78115001 is an apocalyptic number.

It is an amenable number.

78115001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78115001 is an equidigital number, since it uses as much as digits as its factorization.

78115001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 23.

The square root of 78115001 is about 8838.2691178760. The cubic root of 78115001 is about 427.4757479716.

Adding to 78115001 its reverse (10051187), we get a palindrome (88166188).

The spelling of 78115001 in words is "seventy-eight million, one hundred fifteen thousand, one".