87063521 has 2 divisors, whose sum is σ = 87063522. Its totient is φ = 87063520.

The previous prime is 87063503. The next prime is 87063551. The reversal of 87063521 is 12536078.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66912400 + 20151121 = 8180^2 + 4489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87063521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87063551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43531760 + 43531761.

It is an arithmetic number, because the mean of its divisors is an integer number (43531761).

Almost surely, 2^87063521 is an apocalyptic number.

It is an amenable number.

87063521 is a deficient number, since it is larger than the sum of its proper divisors (1).

87063521 is an equidigital number, since it uses as much as digits as its factorization.

87063521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 87063521 is about 9330.7835147966. The cubic root of 87063521 is about 443.2125767679.

Adding to 87063521 its reverse (12536078), we get a palindrome (99599599).

The spelling of 87063521 in words is "eighty-seven million, sixty-three thousand, five hundred twenty-one".