101981806 has 8 divisors (see below), whose sum is σ = 158247720. Its totient is φ = 49232568.

The previous prime is 101981791. The next prime is 101981833. The reversal of 101981806 is 608189101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879096 + ... + 879211.

It is an arithmetic number, because the mean of its divisors is an integer number (19780965).

Almost surely, 2^101981806 is an apocalyptic number.

101981806 is a deficient number, since it is larger than the sum of its proper divisors (56265914).

101981806 is a wasteful number, since it uses less digits than its factorization.

101981806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758338.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 101981806 is about 10098.6041609720. The cubic root of 101981806 is about 467.2050906774.

The spelling of 101981806 in words is "one hundred one million, nine hundred eighty-one thousand, eight hundred six".