89951920109 has 2 divisors, whose sum is σ = 89951920110. Its totient is φ = 89951920108.

The previous prime is 89951920049. The next prime is 89951920129. The reversal of 89951920109 is 90102915998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89354362084 + 597558025 = 298922^2 + 24445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89951920109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89951920129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44975960054 + 44975960055.

It is an arithmetic number, because the mean of its divisors is an integer number (44975960055).

Almost surely, 2^89951920109 is an apocalyptic number.

It is an amenable number.

89951920109 is a deficient number, since it is larger than the sum of its proper divisors (1).

89951920109 is an equidigital number, since it uses as much as digits as its factorization.

89951920109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 53.

The spelling of 89951920109 in words is "eighty-nine billion, nine hundred fifty-one million, nine hundred twenty thousand, one hundred nine".