89125781 has 4 divisors (see below), whose sum is σ = 94368492. Its totient is φ = 83883072.

The previous prime is 89125769. The next prime is 89125783. The reversal of 89125781 is 18752198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18752198 = 2 ⋅9376099.

It can be written as a sum of positive squares in 2 ways, for example, as 57304900 + 31820881 = 7570^2 + 5641^2 .

It is a cyclic number.

It is not a de Polignac number, because 89125781 - 2⁶ = 89125717 is a prime.

It is a super-2 number, since 2×89125781² = 15886809677719922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89125783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2621330 + ... + 2621363.

It is an arithmetic number, because the mean of its divisors is an integer number (23592123).

Almost surely, 2^89125781 is an apocalyptic number.

It is an amenable number.

89125781 is a deficient number, since it is larger than the sum of its proper divisors (5242711).

89125781 is a wasteful number, since it uses less digits than its factorization.

89125781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5242710.

The product of its digits is 40320, while the sum is 41.

The square root of 89125781 is about 9440.6451580387. The cubic root of 89125781 is about 446.6847401786.

The spelling of 89125781 in words is "eighty-nine million, one hundred twenty-five thousand, seven hundred eighty-one".