89871381 has 6 divisors (see below), whose sum is σ = 129814230. Its totient is φ = 59914248.

The previous prime is 89871359. The next prime is 89871389. The reversal of 89871381 is 18317898.

It can be written as a sum of positive squares in only one way, i.e., 89586225 + 285156 = 9465^2 + 534^2 .

It is not a de Polignac number, because 89871381 - 2⁷ = 89871253 is a prime.

It is a super-2 number, since 2×89871381² = 16153730245694322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89871389) 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 in 5 ways as a sum of consecutive naturals, for example, 4992846 + ... + 4992863.

It is an arithmetic number, because the mean of its divisors is an integer number (21635705).

Almost surely, 2^89871381 is an apocalyptic number.

It is an amenable number.

89871381 is a deficient number, since it is larger than the sum of its proper divisors (39942849).

89871381 is a wasteful number, since it uses less digits than its factorization.

89871381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9985715 (or 9985712 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 89871381 is about 9480.0517403651. The cubic root of 89871381 is about 447.9268936964.

The spelling of 89871381 in words is "eighty-nine million, eight hundred seventy-one thousand, three hundred eighty-one".