109215071 has 18 divisors (see below), whose sum is σ = 129378600. Its totient is φ = 91924560.

The previous prime is 109215061. The next prime is 109215079. The reversal of 109215071 is 170512901.

It is a de Polignac number, because none of the positive numbers 2^k-109215071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109215071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109215079) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 182030 + ... + 182628.

It is an arithmetic number, because the mean of its divisors is an integer number (7187700).

Almost surely, 2^109215071 is an apocalyptic number.

109215071 is a deficient number, since it is larger than the sum of its proper divisors (20163529).

109215071 is an frugal number, since it uses more digits than its factorization.

109215071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 109215071 is about 10450.6014659444. The cubic root of 109215071 is about 477.9995900512. Note that the first 3 decimals are identical.

Adding to 109215071 its reverse (170512901), we get a palindrome (279727972).

The spelling of 109215071 in words is "one hundred nine million, two hundred fifteen thousand, seventy-one".