71906109 has 32 divisors (see below), whose sum is σ = 109002240. Its totient is φ = 41764800.

The previous prime is 71906077. The next prime is 71906111. The reversal of 71906109 is 90160917.

It is not a de Polignac number, because 71906109 - 2⁵ = 71906077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71906109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71906189) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 217074 + ... + 217404.

It is an arithmetic number, because the mean of its divisors is an integer number (3406320).

Almost surely, 2^71906109 is an apocalyptic number.

It is an amenable number.

71906109 is a deficient number, since it is larger than the sum of its proper divisors (37096131).

71906109 is a wasteful number, since it uses less digits than its factorization.

71906109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 71906109 is about 8479.7469891501. The cubic root of 71906109 is about 415.8358515498.

The spelling of 71906109 in words is "seventy-one million, nine hundred six thousand, one hundred nine".