84643531 has 12 divisors (see below), whose sum is σ = 101126208. Its totient is φ = 70589232.

The previous prime is 84643529. The next prime is 84643543. The reversal of 84643531 is 13534648.

It is a happy number.

It is not a de Polignac number, because 84643531 - 2¹ = 84643529 is a prime.

It is a super-2 number, since 2×84643531² = 14329054680295922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84643511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21531 + ... + 25156.

It is an arithmetic number, because the mean of its divisors is an integer number (8427184).

Almost surely, 2^84643531 is an apocalyptic number.

84643531 is a deficient number, since it is larger than the sum of its proper divisors (16482677).

84643531 is a wasteful number, since it uses less digits than its factorization.

84643531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46738 (or 46731 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 84643531 is about 9200.1919001725. The cubic root of 84643531 is about 439.0674654125.

The spelling of 84643531 in words is "eighty-four million, six hundred forty-three thousand, five hundred thirty-one".