89507981 has 4 divisors (see below), whose sum is σ = 89650464. Its totient is φ = 89365500.

The previous prime is 89507911. The next prime is 89507987. The reversal of 89507981 is 18970598.

It is a happy number.

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 not a de Polignac number, because 89507981 - 2¹⁸ = 89245837 is a prime.

It is a super-2 number, since 2×89507981² = 16023357325392722, 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 (89507987) 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, 70295 + ... + 71556.

It is an arithmetic number, because the mean of its divisors is an integer number (22412616).

Almost surely, 2^89507981 is an apocalyptic number.

It is an amenable number.

89507981 is a deficient number, since it is larger than the sum of its proper divisors (142483).

89507981 is a wasteful number, since it uses less digits than its factorization.

89507981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142482.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 89507981 is about 9460.8657637660. The cubic root of 89507981 is about 447.3223388894.

The spelling of 89507981 in words is "eighty-nine million, five hundred seven thousand, nine hundred eighty-one".