89409981 has 4 divisors (see below), whose sum is σ = 119213312. Its totient is φ = 59606652.

The previous prime is 89409979. The next prime is 89410001. The reversal of 89409981 is 18990498.

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 not a de Polignac number, because 89409981 - 2¹ = 89409979 is a prime.

It is a super-2 number, since 2×89409981² = 15988289404840722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89409981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89409911) 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, 14901661 + ... + 14901666.

It is an arithmetic number, because the mean of its divisors is an integer number (29803328).

Almost surely, 2^89409981 is an apocalyptic number.

It is an amenable number.

89409981 is a deficient number, since it is larger than the sum of its proper divisors (29803331).

89409981 is a wasteful number, since it uses less digits than its factorization.

89409981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29803330.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 89409981 is about 9455.6851153155. The cubic root of 89409981 is about 447.1590253415.

The spelling of 89409981 in words is "eighty-nine million, four hundred nine thousand, nine hundred eighty-one".