82431381 has 8 divisors (see below), whose sum is σ = 111414400. Its totient is φ = 54201312.

The previous prime is 82431347. The next prime is 82431383. The reversal of 82431381 is 18313428.

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

It is not a de Polignac number, because 82431381 - 2¹⁹ = 81907093 is a prime.

It is a super-2 number, since 2×82431381² = 13589865147134322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82431383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187981 + ... + 188418.

It is an arithmetic number, because the mean of its divisors is an integer number (13926800).

Almost surely, 2^82431381 is an apocalyptic number.

It is an amenable number.

82431381 is a deficient number, since it is larger than the sum of its proper divisors (28983019).

82431381 is a wasteful number, since it uses less digits than its factorization.

82431381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376475.

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

The square root of 82431381 is about 9079.1729248869. The cubic root of 82431381 is about 435.2086566686.

The spelling of 82431381 in words is "eighty-two million, four hundred thirty-one thousand, three hundred eighty-one".