79511 has 4 divisors (see below), whose sum is σ = 82992. Its totient is φ = 76032.

The previous prime is 79493. The next prime is 79531. The reversal of 79511 is 11597.

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 79511 - 2¹⁰ = 78487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 3457 = 79511 / (7 + 9 + 5 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79531) 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, 1706 + ... + 1751.

It is an arithmetic number, because the mean of its divisors is an integer number (20748).

2⁷⁹⁵¹¹ is an apocalyptic number.

79511 is a deficient number, since it is larger than the sum of its proper divisors (3481).

79511 is a wasteful number, since it uses less digits than its factorization.

79511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480.

The product of its digits is 315, while the sum is 23.

The square root of 79511 is about 281.9769494125. The cubic root of 79511 is about 43.0007210984. Note that the first 3 decimals are identical.

The spelling of 79511 in words is "seventy-nine thousand, five hundred eleven".