89487781 has 2 divisors, whose sum is σ = 89487782. Its totient is φ = 89487780.

The previous prime is 89487721. The next prime is 89487787. The reversal of 89487781 is 18778498.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85858756 + 3629025 = 9266^2 + 1905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89487781 is a prime.

It is a super-2 number, since 2×89487781² = 16016125896607922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89487787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44743890 + 44743891.

It is an arithmetic number, because the mean of its divisors is an integer number (44743891).

Almost surely, 2^89487781 is an apocalyptic number.

It is an amenable number.

89487781 is a deficient number, since it is larger than the sum of its proper divisors (1).

89487781 is an equidigital number, since it uses as much as digits as its factorization.

89487781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 52.

The square root of 89487781 is about 9459.7981479522. The cubic root of 89487781 is about 447.2886860577.

The spelling of 89487781 in words is "eighty-nine million, four hundred eighty-seven thousand, seven hundred eighty-one".