82381431 has 16 divisors (see below), whose sum is σ = 123960960. Its totient is φ = 48205920.

The previous prime is 82381417. The next prime is 82381441. The reversal of 82381431 is 13418328.

It is not a de Polignac number, because 82381431 - 2⁵ = 82381399 is a prime.

It is a super-2 number, since 2×82381431² = 13573400347215522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82381441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42085 + ... + 43998.

It is an arithmetic number, because the mean of its divisors is an integer number (7747560).

Almost surely, 2^82381431 is an apocalyptic number.

82381431 is a deficient number, since it is larger than the sum of its proper divisors (41579529).

82381431 is a wasteful number, since it uses less digits than its factorization.

82381431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86126.

The product of its digits is 4608, while the sum is 30.

The square root of 82381431 is about 9076.4217068182. The cubic root of 82381431 is about 435.1207327715.

Adding to 82381431 its reverse (13418328), we get a palindrome (95799759).

It can be divided in two parts, 8238 and 1431, that added together give a palindrome (9669).

The spelling of 82381431 in words is "eighty-two million, three hundred eighty-one thousand, four hundred thirty-one".