89371781 has 4 divisors (see below), whose sum is σ = 89410752. Its totient is φ = 89332812.

The previous prime is 89371757. The next prime is 89371787. The reversal of 89371781 is 18717398.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89371781 is a prime.

It is a super-2 number, since 2×89371781² = 15974630478223922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89371787) 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 3 ways as a sum of consecutive naturals, for example, 15815 + ... + 20708.

It is an arithmetic number, because the mean of its divisors is an integer number (22352688).

Almost surely, 2^89371781 is an apocalyptic number.

It is an amenable number.

89371781 is a deficient number, since it is larger than the sum of its proper divisors (38971).

89371781 is a wasteful number, since it uses less digits than its factorization.

89371781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38970.

The product of its digits is 84672, while the sum is 44.

The square root of 89371781 is about 9453.6649506950. The cubic root of 89371781 is about 447.0953340629.

The spelling of 89371781 in words is "eighty-nine million, three hundred seventy-one thousand, seven hundred eighty-one".