82181507 has 8 divisors (see below), whose sum is σ = 87847200. Its totient is φ = 76690240.

The previous prime is 82181501. The next prime is 82181509. The reversal of 82181507 is 70518128.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82181507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82181501) 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, 42632 + ... + 44517.

It is an arithmetic number, because the mean of its divisors is an integer number (10980900).

Almost surely, 2^82181507 is an apocalyptic number.

82181507 is a deficient number, since it is larger than the sum of its proper divisors (5665693).

82181507 is a wasteful number, since it uses less digits than its factorization.

82181507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87213.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 82181507 is about 9065.4016458180. The cubic root of 82181507 is about 434.7684626802.

It can be divided in two parts, 821 and 81507, that added together give a palindrome (82328).

The spelling of 82181507 in words is "eighty-two million, one hundred eighty-one thousand, five hundred seven".