89121861 has 12 divisors (see below), whose sum is σ = 129586080. Its totient is φ = 59020200.

The previous prime is 89121821. The next prime is 89121887. The reversal of 89121861 is 16812198.

It is not a de Polignac number, because 89121861 - 2⁶ = 89121797 is a prime.

It is a super-2 number, since 2×89121861² = 15885412216206642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89121811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31431 + ... + 34148.

It is an arithmetic number, because the mean of its divisors is an integer number (10798840).

Almost surely, 2^89121861 is an apocalyptic number.

It is an amenable number.

89121861 is a deficient number, since it is larger than the sum of its proper divisors (40464219).

89121861 is a wasteful number, since it uses less digits than its factorization.

89121861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65736 (or 65733 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 89121861 is about 9440.4375428261. The cubic root of 89121861 is about 446.6781912697.

The spelling of 89121861 in words is "eighty-nine million, one hundred twenty-one thousand, eight hundred sixty-one".