84237561 has 12 divisors (see below), whose sum is σ = 121994340. Its totient is φ = 56011680.

The previous prime is 84237557. The next prime is 84237563. The reversal of 84237561 is 16573248.

It can be written as a sum of positive squares in 2 ways, for example, as 59675625 + 24561936 = 7725^2 + 4956^2 .

It is not a de Polignac number, because 84237561 - 2² = 84237557 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (84237563) 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, 8530 + ... + 15531.

It is an arithmetic number, because the mean of its divisors is an integer number (10166195).

Almost surely, 2^84237561 is an apocalyptic number.

It is an amenable number.

84237561 is a deficient number, since it is larger than the sum of its proper divisors (37756779).

84237561 is a wasteful number, since it uses less digits than its factorization.

84237561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24456 (or 24453 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 84237561 is about 9178.1022548237. The cubic root of 84237561 is about 438.3643837087.

The spelling of 84237561 in words is "eighty-four million, two hundred thirty-seven thousand, five hundred sixty-one".