17972901109 has 16 divisors (see below), whose sum is σ = 20039754240. Its totient is φ = 16031727360.

The previous prime is 17972901043. The next prime is 17972901113. The reversal of 17972901109 is 90110927971.

It is a cyclic number.

It is not a de Polignac number, because 17972901109 - 2¹⁷ = 17972770037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17972905109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168237 + ... + 253474.

It is an arithmetic number, because the mean of its divisors is an integer number (1252484640).

Almost surely, 2^17972901109 is an apocalyptic number.

It is an amenable number.

17972901109 is a deficient number, since it is larger than the sum of its proper divisors (2066853131).

17972901109 is a wasteful number, since it uses less digits than its factorization.

17972901109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421860.

The product of its (nonzero) digits is 71442, while the sum is 46.

It can be divided in two parts, 17972901 and 109, that added together give a triangular number (17973010 = T₅₉₉₅).

The spelling of 17972901109 in words is "seventeen billion, nine hundred seventy-two million, nine hundred one thousand, one hundred nine".