101071809 has 6 divisors (see below), whose sum is σ = 145992626. Its totient is φ = 67381200.

The previous prime is 101071799. The next prime is 101071829. The reversal of 101071809 is 908170101.

It can be written as a sum of positive squares in only one way, i.e., 100942209 + 129600 = 10047^2 + 360^2 .

It is not a de Polignac number, because 101071809 - 2⁴ = 101071793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101071829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5615092 + ... + 5615109.

Almost surely, 2^101071809 is an apocalyptic number.

It is an amenable number.

101071809 is a deficient number, since it is larger than the sum of its proper divisors (44920817).

101071809 is a wasteful number, since it uses less digits than its factorization.

101071809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11230207 (or 11230204 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 101071809 is about 10053.4476176086. The cubic root of 101071809 is about 465.8112926856.

The spelling of 101071809 in words is "one hundred one million, seventy-one thousand, eight hundred nine".