84128537 has 2 divisors, whose sum is σ = 84128538. Its totient is φ = 84128536.

The previous prime is 84128531. The next prime is 84128557. The reversal of 84128537 is 73582148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80928016 + 3200521 = 8996^2 + 1789^2 .

It is a cyclic number.

It is not a de Polignac number, because 84128537 - 2⁸ = 84128281 is a prime.

It is a super-2 number, since 2×84128537² = 14155221475520738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84128537.

It is not a weakly prime, because it can be changed into another prime (84128531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42064268 + 42064269.

It is an arithmetic number, because the mean of its divisors is an integer number (42064269).

Almost surely, 2^84128537 is an apocalyptic number.

It is an amenable number.

84128537 is a deficient number, since it is larger than the sum of its proper divisors (1).

84128537 is an equidigital number, since it uses as much as digits as its factorization.

84128537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 84128537 is about 9172.1609776541. The cubic root of 84128537 is about 438.1751851646.

The spelling of 84128537 in words is "eighty-four million, one hundred twenty-eight thousand, five hundred thirty-seven".