82817381 has 4 divisors (see below), whose sum is σ = 82963500. Its totient is φ = 82671264.

The previous prime is 82817363. The next prime is 82817401. The reversal of 82817381 is 18371828.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38328481 + 44488900 = 6191^2 + 6670^2 .

It is a cyclic number.

It is not a de Polignac number, because 82817381 - 2¹⁴ = 82800997 is a prime.

It is a super-3 number, since 3×82817381³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82817681) 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, 72206 + ... + 73343.

It is an arithmetic number, because the mean of its divisors is an integer number (20740875).

Almost surely, 2^82817381 is an apocalyptic number.

It is an amenable number.

82817381 is a deficient number, since it is larger than the sum of its proper divisors (146119).

82817381 is a wasteful number, since it uses less digits than its factorization.

82817381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146118.

The product of its digits is 21504, while the sum is 38.

The square root of 82817381 is about 9100.4055404141. The cubic root of 82817381 is about 435.8869137595.

The spelling of 82817381 in words is "eighty-two million, eight hundred seventeen thousand, three hundred eighty-one".