89447509 has 2 divisors, whose sum is σ = 89447510. Its totient is φ = 89447508.

The previous prime is 89447467. The next prime is 89447521. The reversal of 89447509 is 90574498.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87946884 + 1500625 = 9378^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 89447509 - 2⁷ = 89447381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89447539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44723754 + 44723755.

It is an arithmetic number, because the mean of its divisors is an integer number (44723755).

Almost surely, 2^89447509 is an apocalyptic number.

It is an amenable number.

89447509 is a deficient number, since it is larger than the sum of its proper divisors (1).

89447509 is an equidigital number, since it uses as much as digits as its factorization.

89447509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 89447509 is about 9457.6693217727. The cubic root of 89447509 is about 447.2215785241.

The spelling of 89447509 in words is "eighty-nine million, four hundred forty-seven thousand, five hundred nine".