84537281 has 4 divisors (see below), whose sum is σ = 84975492. Its totient is φ = 84099072.

The previous prime is 84537263. The next prime is 84537283. The reversal of 84537281 is 18273548.

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 17297281 + 67240000 = 4159^2 + 8200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84537281 is a prime.

It is a super-2 number, since 2×84537281² = 14293103757745922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84537283) 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, 218816 + ... + 219201.

It is an arithmetic number, because the mean of its divisors is an integer number (21243873).

Almost surely, 2^84537281 is an apocalyptic number.

It is an amenable number.

84537281 is a deficient number, since it is larger than the sum of its proper divisors (438211).

84537281 is a wasteful number, since it uses less digits than its factorization.

84537281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438210.

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

The square root of 84537281 is about 9194.4157508784. The cubic root of 84537281 is about 438.8836732549.

The spelling of 84537281 in words is "eighty-four million, five hundred thirty-seven thousand, two hundred eighty-one".