78917051 has 4 divisors (see below), whose sum is σ = 83070600. Its totient is φ = 74763504.

The previous prime is 78917029. The next prime is 78917081. The reversal of 78917051 is 15071987.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78917051 - 2⁶ = 78916987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78916996 and 78917014.

It is not an unprimeable number, because it can be changed into a prime (78917011) 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, 2076746 + ... + 2076783.

It is an arithmetic number, because the mean of its divisors is an integer number (20767650).

Almost surely, 2^78917051 is an apocalyptic number.

78917051 is a deficient number, since it is larger than the sum of its proper divisors (4153549).

78917051 is a wasteful number, since it uses less digits than its factorization.

78917051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153548.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 78917051 is about 8883.5269459827. The cubic root of 78917051 is about 428.9338125059.

The spelling of 78917051 in words is "seventy-eight million, nine hundred seventeen thousand, fifty-one".