89841193781 has 2 divisors, whose sum is σ = 89841193782. Its totient is φ = 89841193780.

The previous prime is 89841193759. The next prime is 89841193787. The reversal of 89841193781 is 18739114898.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69674353681 + 20166840100 = 263959^2 + 142010^2 .

It is a cyclic number.

It is not a de Polignac number, because 89841193781 - 2¹⁰ = 89841192757 is a prime.

It is a super-2 number, since 2×89841193781² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 89841193781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89841193787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44920596890 + 44920596891.

It is an arithmetic number, because the mean of its divisors is an integer number (44920596891).

Almost surely, 2^89841193781 is an apocalyptic number.

It is an amenable number.

89841193781 is a deficient number, since it is larger than the sum of its proper divisors (1).

89841193781 is an equidigital number, since it uses as much as digits as its factorization.

89841193781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 59.

The spelling of 89841193781 in words is "eighty-nine billion, eight hundred forty-one million, one hundred ninety-three thousand, seven hundred eighty-one".