79154905 has 4 divisors (see below), whose sum is σ = 94985892. Its totient is φ = 63323920.

The previous prime is 79154903. The next prime is 79154923. The reversal of 79154905 is 50945197.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41835024 + 37319881 = 6468^2 + 6109^2 .

It is not a de Polignac number, because 79154905 - 2¹ = 79154903 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79154903) 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, 7915486 + ... + 7915495.

It is an arithmetic number, because the mean of its divisors is an integer number (23746473).

Almost surely, 2^79154905 is an apocalyptic number.

It is an amenable number.

79154905 is a deficient number, since it is larger than the sum of its proper divisors (15830987).

79154905 is a wasteful number, since it uses less digits than its factorization.

79154905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15830986.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 79154905 is about 8896.9042368680. The cubic root of 79154905 is about 429.3643121853.

It can be divided in two parts, 791 and 54905, that added together give a square (55696 = 236²).

The spelling of 79154905 in words is "seventy-nine million, one hundred fifty-four thousand, nine hundred five".