87245681 has 2 divisors, whose sum is σ = 87245682. Its totient is φ = 87245680.

The previous prime is 87245629. The next prime is 87245689. The reversal of 87245681 is 18654278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85396081 + 1849600 = 9241^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 87245681 - 2¹⁴ = 87229297 is a prime.

It is a super-2 number, since 2×87245681² = 15223617706307522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87245689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43622840 + 43622841.

It is an arithmetic number, because the mean of its divisors is an integer number (43622841).

Almost surely, 2^87245681 is an apocalyptic number.

It is an amenable number.

87245681 is a deficient number, since it is larger than the sum of its proper divisors (1).

87245681 is an equidigital number, since it uses as much as digits as its factorization.

87245681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 41.

The square root of 87245681 is about 9340.5396525040. The cubic root of 87245681 is about 443.5214675664.

The spelling of 87245681 in words is "eighty-seven million, two hundred forty-five thousand, six hundred eighty-one".