109919581 has 2 divisors, whose sum is σ = 109919582. Its totient is φ = 109919580.

The previous prime is 109919549. The next prime is 109919591. The reversal of 109919581 is 185919901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72097081 + 37822500 = 8491^2 + 6150^2 .

It is an emirp because it is prime and its reverse (185919901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109919581 - 2⁵ = 109919549 is a prime.

It is a super-2 number, since 2×109919581² = 24164628574431122, which contains 22 as substring.

It is equal to p_6298945 and since 109919581 and 6298945 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109919591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54959790 + 54959791.

It is an arithmetic number, because the mean of its divisors is an integer number (54959791).

Almost surely, 2^109919581 is an apocalyptic number.

It is an amenable number.

109919581 is a deficient number, since it is larger than the sum of its proper divisors (1).

109919581 is an equidigital number, since it uses as much as digits as its factorization.

109919581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 43.

The square root of 109919581 is about 10484.2539553370. The cubic root of 109919581 is about 479.0251932420.

The spelling of 109919581 in words is "one hundred nine million, nine hundred nineteen thousand, five hundred eighty-one".