78315101 has 4 divisors (see below), whose sum is σ = 78334272. Its totient is φ = 78295932.

The previous prime is 78315077. The next prime is 78315103. The reversal of 78315101 is 10151387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78315101 - 2⁶ = 78315037 is a prime.

It is a super-2 number, since 2×78315101² = 12266510089280402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78315103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731 + ... + 12536.

It is an arithmetic number, because the mean of its divisors is an integer number (19583568).

Almost surely, 2^78315101 is an apocalyptic number.

It is an amenable number.

78315101 is a deficient number, since it is larger than the sum of its proper divisors (19171).

78315101 is a wasteful number, since it uses less digits than its factorization.

78315101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19170.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 78315101 is about 8849.5819675282. The cubic root of 78315101 is about 427.8404451559.

Adding to 78315101 its reverse (10151387), we get a palindrome (88466488).

The spelling of 78315101 in words is "seventy-eight million, three hundred fifteen thousand, one hundred one".