78919001 has 4 divisors (see below), whose sum is σ = 90193152. Its totient is φ = 67644852.

The previous prime is 78918953. The next prime is 78919007. The reversal of 78919001 is 10091987.

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 78919001 - 2²⁶ = 11810137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78919007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5637065 + ... + 5637078.

It is an arithmetic number, because the mean of its divisors is an integer number (22548288).

Almost surely, 2^78919001 is an apocalyptic number.

It is an amenable number.

78919001 is a deficient number, since it is larger than the sum of its proper divisors (11274151).

78919001 is a wasteful number, since it uses less digits than its factorization.

78919001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11274150.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 78919001 is about 8883.6366990102. The cubic root of 78919001 is about 428.9373453886.

The spelling of 78919001 in words is "seventy-eight million, nine hundred nineteen thousand, one".