79152509 has 8 divisors (see below), whose sum is σ = 83276088. Its totient is φ = 75133440.

The previous prime is 79152503. The next prime is 79152511. The reversal of 79152509 is 90525197.

It can be written as a sum of positive squares in 4 ways, for example, as 120409 + 79032100 = 347^2 + 8890^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79152509 - 2²⁴ = 62375293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79152503) 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 7 ways as a sum of consecutive naturals, for example, 24572 + ... + 27605.

It is an arithmetic number, because the mean of its divisors is an integer number (10409511).

Almost surely, 2^79152509 is an apocalyptic number.

It is an amenable number.

79152509 is a deficient number, since it is larger than the sum of its proper divisors (4123579).

79152509 is a wasteful number, since it uses less digits than its factorization.

79152509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52255.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 79152509 is about 8896.7695822697. The cubic root of 79152509 is about 429.3599798900.

The spelling of 79152509 in words is "seventy-nine million, one hundred fifty-two thousand, five hundred nine".