82431709 has 4 divisors (see below), whose sum is σ = 86770240. Its totient is φ = 78093180.

The previous prime is 82431707. The next prime is 82431719. The reversal of 82431709 is 90713428.

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 82431709 - 2¹ = 82431707 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 (82431703) 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, 2169237 + ... + 2169274.

It is an arithmetic number, because the mean of its divisors is an integer number (21692560).

Almost surely, 2^82431709 is an apocalyptic number.

It is an amenable number.

82431709 is a deficient number, since it is larger than the sum of its proper divisors (4338531).

82431709 is a wasteful number, since it uses less digits than its factorization.

82431709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338530.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 82431709 is about 9079.1909881883. The cubic root of 82431709 is about 435.2092339093.

The spelling of 82431709 in words is "eighty-two million, four hundred thirty-one thousand, seven hundred nine".