82147531 has 8 divisors (see below), whose sum is σ = 82830384. Its totient is φ = 81468000.

The previous prime is 82147487. The next prime is 82147543. The reversal of 82147531 is 13574128.

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

It is a cyclic number.

It is not a de Polignac number, because 82147531 - 2²¹ = 80050379 is a prime.

It is a super-2 number, since 2×82147531² = 13496433698791922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82147493 and 82147502.

It is not an unprimeable number, because it can be changed into a prime (82147591) 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, 72985 + ... + 74101.

It is an arithmetic number, because the mean of its divisors is an integer number (10353798).

Almost surely, 2^82147531 is an apocalyptic number.

82147531 is a deficient number, since it is larger than the sum of its proper divisors (682853).

82147531 is a wasteful number, since it uses less digits than its factorization.

82147531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661.

The product of its digits is 6720, while the sum is 31.

The square root of 82147531 is about 9063.5275141636. The cubic root of 82147531 is about 434.7085395095.

The spelling of 82147531 in words is "eighty-two million, one hundred forty-seven thousand, five hundred thirty-one".