89721761 has 4 divisors (see below), whose sum is σ = 89741124. Its totient is φ = 89702400.

The previous prime is 89721757. The next prime is 89721773. The reversal of 89721761 is 16712798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16712798 = 2 ⋅8356399.

It can be written as a sum of positive squares in 2 ways, for example, as 54390625 + 35331136 = 7375^2 + 5944^2 .

It is a cyclic number.

It is not a de Polignac number, because 89721761 - 2² = 89721757 is a prime.

It is a super-2 number, since 2×89721761² = 16099988793882242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89721721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1841 + ... + 13521.

It is an arithmetic number, because the mean of its divisors is an integer number (22435281).

Almost surely, 2^89721761 is an apocalyptic number.

It is an amenable number.

89721761 is a deficient number, since it is larger than the sum of its proper divisors (19363).

89721761 is a wasteful number, since it uses less digits than its factorization.

89721761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19362.

The product of its digits is 42336, while the sum is 41.

The square root of 89721761 is about 9472.1571460782. The cubic root of 89721761 is about 447.6781825308.

The spelling of 89721761 in words is "eighty-nine million, seven hundred twenty-one thousand, seven hundred sixty-one".