82643537 has 2 divisors, whose sum is σ = 82643538. Its totient is φ = 82643536.

The previous prime is 82643501. The next prime is 82643557. The reversal of 82643537 is 73534628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82428241 + 215296 = 9079^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 82643537 - 2¹⁸ = 82381393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82643537.

It is not a weakly prime, because it can be changed into another prime (82643557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41321768 + 41321769.

It is an arithmetic number, because the mean of its divisors is an integer number (41321769).

Almost surely, 2^82643537 is an apocalyptic number.

It is an amenable number.

82643537 is a deficient number, since it is larger than the sum of its proper divisors (1).

82643537 is an equidigital number, since it uses as much as digits as its factorization.

82643537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 82643537 is about 9090.8490802565. The cubic root of 82643537 is about 435.5817064590.

The spelling of 82643537 in words is "eighty-two million, six hundred forty-three thousand, five hundred thirty-seven".