100808649 has 6 divisors (see below), whose sum is σ = 145612506. Its totient is φ = 67205760.

The previous prime is 100808647. The next prime is 100808671. The reversal of 100808649 is 946808001.

It is a happy number.

100808649 is a `hidden beast` number, since 1 + 0 + 0 + 8 + 0 + 8 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 69806025 + 31002624 = 8355^2 + 5568^2 .

It is not a de Polignac number, because 100808649 - 2¹ = 100808647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100808647) 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, 5600472 + ... + 5600489.

It is an arithmetic number, because the mean of its divisors is an integer number (24268751).

Almost surely, 2^100808649 is an apocalyptic number.

It is an amenable number.

100808649 is a deficient number, since it is larger than the sum of its proper divisors (44803857).

100808649 is a wasteful number, since it uses less digits than its factorization.

100808649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11200967 (or 11200964 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 100808649 is about 10040.3510396798. The cubic root of 100808649 is about 465.4066647134.

The spelling of 100808649 in words is "one hundred million, eight hundred eight thousand, six hundred forty-nine".