19970109 has 6 divisors (see below), whose sum is σ = 28845726. Its totient is φ = 13313400.

The previous prime is 19970081. The next prime is 19970117. The reversal of 19970109 is 90107991.

It can be written as a sum of positive squares in only one way, i.e., 19554084 + 416025 = 4422^2 + 645^2 .

It is not a de Polignac number, because 19970109 - 2⁵ = 19970077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19970149) 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, 1109442 + ... + 1109459.

It is an arithmetic number, because the mean of its divisors is an integer number (4807621).

Almost surely, 2^19970109 is an apocalyptic number.

It is an amenable number.

19970109 is a deficient number, since it is larger than the sum of its proper divisors (8875617).

19970109 is a wasteful number, since it uses less digits than its factorization.

19970109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218907 (or 2218904 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 19970109 is about 4468.7927900049. The cubic root of 19970109 is about 271.3064664737.

The spelling of 19970109 in words is "nineteen million, nine hundred seventy thousand, one hundred nine".