109508979581 has 2 divisors, whose sum is σ = 109508979582. Its totient is φ = 109508979580.

The previous prime is 109508979523. The next prime is 109508979589. The reversal of 109508979581 is 185979805901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103845062500 + 5663917081 = 322250^2 + 75259^2 .

It is an emirp because it is prime and its reverse (185979805901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109508979581 is a prime.

It is a super-2 number, since 2×109508979581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109508979589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54754489790 + 54754489791.

It is an arithmetic number, because the mean of its divisors is an integer number (54754489791).

Almost surely, 2^109508979581 is an apocalyptic number.

It is an amenable number.

109508979581 is a deficient number, since it is larger than the sum of its proper divisors (1).

109508979581 is an equidigital number, since it uses as much as digits as its factorization.

109508979581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 62.

The spelling of 109508979581 in words is "one hundred nine billion, five hundred eight million, nine hundred seventy-nine thousand, five hundred eighty-one".