87258989 has 2 divisors, whose sum is σ = 87258990. Its totient is φ = 87258988.

The previous prime is 87258973. The next prime is 87259013. The reversal of 87258989 is 98985278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 15721225 = 8458^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 87258989 - 2⁴ = 87258973 is a prime.

It is a super-2 number, since 2×87258989² = 15228262322604242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87258959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43629494 + 43629495.

It is an arithmetic number, because the mean of its divisors is an integer number (43629495).

Almost surely, 2^87258989 is an apocalyptic number.

It is an amenable number.

87258989 is a deficient number, since it is larger than the sum of its proper divisors (1).

87258989 is an equidigital number, since it uses as much as digits as its factorization.

87258989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 56.

The square root of 87258989 is about 9341.2520038804. The cubic root of 87258989 is about 443.5440172351.

The spelling of 87258989 in words is "eighty-seven million, two hundred fifty-eight thousand, nine hundred eighty-nine".