17981097 has 4 divisors (see below), whose sum is σ = 23974800. Its totient is φ = 11987396.

The previous prime is 17981081. The next prime is 17981099. The reversal of 17981097 is 79018971.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 17981097 - 2⁴ = 17981081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17981099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2996847 + ... + 2996852.

It is an arithmetic number, because the mean of its divisors is an integer number (5993700).

Almost surely, 2^17981097 is an apocalyptic number.

It is an amenable number.

17981097 is a deficient number, since it is larger than the sum of its proper divisors (5993703).

17981097 is an equidigital number, since it uses as much as digits as its factorization.

17981097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5993702.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 17981097 is about 4240.4123620233. The cubic root of 17981097 is about 261.9823667794.

The spelling of 17981097 in words is "seventeen million, nine hundred eighty-one thousand, ninety-seven".