89745181 has 2 divisors, whose sum is σ = 89745182. Its totient is φ = 89745180.

The previous prime is 89745179. The next prime is 89745199. The reversal of 89745181 is 18154798.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86322681 + 3422500 = 9291^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 89745181 - 2¹ = 89745179 is a prime.

It is a super-2 number, since 2×89745181² = 16108395025445522, which contains 22 as substring.

Together with 89745179, 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 (89745101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44872590 + 44872591.

It is an arithmetic number, because the mean of its divisors is an integer number (44872591).

Almost surely, 2^89745181 is an apocalyptic number.

89745181 is the 5992-nd centered pentagonal number.

It is an amenable number.

89745181 is a deficient number, since it is larger than the sum of its proper divisors (1).

89745181 is an equidigital number, since it uses as much as digits as its factorization.

89745181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 89745181 is about 9473.3933202417. The cubic root of 89745181 is about 447.7171315022.

The spelling of 89745181 in words is "eighty-nine million, seven hundred forty-five thousand, one hundred eighty-one".