17121493 has 4 divisors (see below), whose sum is σ = 17356108. Its totient is φ = 16886880.

The previous prime is 17121469. The next prime is 17121557. The reversal of 17121493 is 39412171.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9381969 + 7739524 = 3063^2 + 2782^2 .

It is a cyclic number.

It is not a de Polignac number, because 17121493 - 2⁹ = 17120981 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 (17121443) 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, 117198 + ... + 117343.

It is an arithmetic number, because the mean of its divisors is an integer number (4339027).

Almost surely, 2^17121493 is an apocalyptic number.

It is an amenable number.

17121493 is a deficient number, since it is larger than the sum of its proper divisors (234615).

17121493 is an equidigital number, since it uses as much as digits as its factorization.

17121493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234614.

The product of its digits is 1512, while the sum is 28.

The square root of 17121493 is about 4137.8125863794. The cubic root of 17121493 is about 257.7392403759.

The spelling of 17121493 in words is "seventeen million, one hundred twenty-one thousand, four hundred ninety-three".