87489013 has 2 divisors, whose sum is σ = 87489014. Its totient is φ = 87489012.

The previous prime is 87488983. The next prime is 87489019. The reversal of 87489013 is 31098478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87478609 + 10404 = 9353^2 + 102^2 .

It is a cyclic number.

It is not a de Polignac number, because 87489013 - 2⁵ = 87488981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87489019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43744506 + 43744507.

It is an arithmetic number, because the mean of its divisors is an integer number (43744507).

Almost surely, 2^87489013 is an apocalyptic number.

It is an amenable number.

87489013 is a deficient number, since it is larger than the sum of its proper divisors (1).

87489013 is an equidigital number, since it uses as much as digits as its factorization.

87489013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 87489013 is about 9353.5561686452. The cubic root of 87489013 is about 443.9334183768.

The spelling of 87489013 in words is "eighty-seven million, four hundred eighty-nine thousand, thirteen".