89061781 has 2 divisors, whose sum is σ = 89061782. Its totient is φ = 89061780.

The previous prime is 89061779. The next prime is 89061809. The reversal of 89061781 is 18716098.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64400625 + 24661156 = 8025^2 + 4966^2 .

It is a cyclic number.

It is not a de Polignac number, because 89061781 - 2¹ = 89061779 is a prime.

It is a super-2 number, since 2×89061781² = 15864001669783922, which contains 22 as substring.

Together with 89061779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89061751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44530890 + 44530891.

It is an arithmetic number, because the mean of its divisors is an integer number (44530891).

Almost surely, 2^89061781 is an apocalyptic number.

It is an amenable number.

89061781 is a deficient number, since it is larger than the sum of its proper divisors (1).

89061781 is an equidigital number, since it uses as much as digits as its factorization.

89061781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 89061781 is about 9437.2549504610. The cubic root of 89061781 is about 446.5777951823.

The spelling of 89061781 in words is "eighty-nine million, sixty-one thousand, seven hundred eighty-one".