78312113 has 4 divisors (see below), whose sum is σ = 85431408. Its totient is φ = 71192820.

The previous prime is 78312109. The next prime is 78312127. The reversal of 78312113 is 31121387.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31121387 = 11 ⋅2829217.

It is a cyclic number.

It is not a de Polignac number, because 78312113 - 2² = 78312109 is a prime.

It is a super-2 number, since 2×78312113² = 12265574085049538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78312133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559631 + ... + 3559652.

It is an arithmetic number, because the mean of its divisors is an integer number (21357852).

Almost surely, 2^78312113 is an apocalyptic number.

It is an amenable number.

78312113 is a deficient number, since it is larger than the sum of its proper divisors (7119295).

78312113 is a wasteful number, since it uses less digits than its factorization.

78312113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7119294.

The product of its digits is 1008, while the sum is 26.

The square root of 78312113 is about 8849.4131443842. The cubic root of 78312113 is about 427.8350038745.

The spelling of 78312113 in words is "seventy-eight million, three hundred twelve thousand, one hundred thirteen".