101109992509 has 2 divisors, whose sum is σ = 101109992510. Its totient is φ = 101109992508.

The previous prime is 101109992497. The next prime is 101109992551. The reversal of 101109992509 is 905299901101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99132411609 + 1977580900 = 314853^2 + 44470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101109992509 is a prime.

It is a super-2 number, since 2×101109992509² (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 (101109992569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50554996254 + 50554996255.

It is an arithmetic number, because the mean of its divisors is an integer number (50554996255).

Almost surely, 2^101109992509 is an apocalyptic number.

It is an amenable number.

101109992509 is a deficient number, since it is larger than the sum of its proper divisors (1).

101109992509 is an equidigital number, since it uses as much as digits as its factorization.

101109992509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 46.

The spelling of 101109992509 in words is "one hundred one billion, one hundred nine million, nine hundred ninety-two thousand, five hundred nine".