17972117 has 2 divisors, whose sum is σ = 17972118. Its totient is φ = 17972116.

The previous prime is 17972099. The next prime is 17972153. The reversal of 17972117 is 71127971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 70756 = 4231^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 17972117 - 2¹² = 17968021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17978117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8986058 + 8986059.

It is an arithmetic number, because the mean of its divisors is an integer number (8986059).

Almost surely, 2^17972117 is an apocalyptic number.

It is an amenable number.

17972117 is a deficient number, since it is larger than the sum of its proper divisors (1).

17972117 is an equidigital number, since it uses as much as digits as its factorization.

17972117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6174, while the sum is 35.

The square root of 17972117 is about 4239.3533705036. The cubic root of 17972117 is about 261.9387470195.

The spelling of 17972117 in words is "seventeen million, nine hundred seventy-two thousand, one hundred seventeen".