89509991 has 2 divisors, whose sum is σ = 89509992. Its totient is φ = 89509990.

The previous prime is 89509967. The next prime is 89510039. The reversal of 89509991 is 19990598.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89509991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89502991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44754995 + 44754996.

It is an arithmetic number, because the mean of its divisors is an integer number (44754996).

Almost surely, 2^89509991 is an apocalyptic number.

89509991 is a deficient number, since it is larger than the sum of its proper divisors (1).

89509991 is an equidigital number, since it uses as much as digits as its factorization.

89509991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 89509991 is about 9460.9719902344. The cubic root of 89509991 is about 447.3256872358.

The spelling of 89509991 in words is "eighty-nine million, five hundred nine thousand, nine hundred ninety-one".