87234543581 has 2 divisors, whose sum is σ = 87234543582. Its totient is φ = 87234543580.

The previous prime is 87234543511. The next prime is 87234543623. The reversal of 87234543581 is 18534543278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62254741081 + 24979802500 = 249509^2 + 158050^2 .

It is a cyclic number.

It is not a de Polignac number, because 87234543581 - 2¹⁴ = 87234527197 is a prime.

It is a super-2 number, since 2×87234543581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87234543511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43617271790 + 43617271791.

It is an arithmetic number, because the mean of its divisors is an integer number (43617271791).

Almost surely, 2^87234543581 is an apocalyptic number.

It is an amenable number.

87234543581 is a deficient number, since it is larger than the sum of its proper divisors (1).

87234543581 is an equidigital number, since it uses as much as digits as its factorization.

87234543581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 50.

The spelling of 87234543581 in words is "eighty-seven billion, two hundred thirty-four million, five hundred forty-three thousand, five hundred eighty-one".