79531 has 2 divisors, whose sum is σ = 79532. Its totient is φ = 79530.

The previous prime is 79493. The next prime is 79537. The reversal of 79531 is 13597.

It is a strong prime.

It is an emirp because it is prime and its reverse (13597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79531 - 2¹³ = 71339 is a prime.

It is a super-2 number, since 2×79531² = 12650359922, which contains 22 as substring.

79531 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 79496 and 79505.

It is not a weakly prime, because it can be changed into another prime (79537) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39765 + 39766.

It is an arithmetic number, because the mean of its divisors is an integer number (39766).

2⁷⁹⁵³¹ is an apocalyptic number.

79531 is a deficient number, since it is larger than the sum of its proper divisors (1).

79531 is an equidigital number, since it uses as much as digits as its factorization.

79531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 945, while the sum is 25.

The square root of 79531 is about 282.0124110744. The cubic root of 79531 is about 43.0043262278.

The spelling of 79531 in words is "seventy-nine thousand, five hundred thirty-one".