17181979253 has 4 divisors (see below), whose sum is σ = 17297294700. Its totient is φ = 17066663808.

The previous prime is 17181979249. The next prime is 17181979261. The reversal of 17181979253 is 35297918171.

It is a happy number.

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 895625329 + 16286353924 = 29927^2 + 127618^2 .

It is a cyclic number.

It is not a de Polignac number, because 17181979253 - 2² = 17181979249 is a prime.

It is a super-2 number, since 2×17181979253² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 17181979195 and 17181979204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17181979223) 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, 57657500 + ... + 57657797.

It is an arithmetic number, because the mean of its divisors is an integer number (4324323675).

Almost surely, 2^17181979253 is an apocalyptic number.

It is an amenable number.

17181979253 is a deficient number, since it is larger than the sum of its proper divisors (115315447).

17181979253 is a wasteful number, since it uses less digits than its factorization.

17181979253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115315446.

The product of its digits is 952560, while the sum is 53.

The spelling of 17181979253 in words is "seventeen billion, one hundred eighty-one million, nine hundred seventy-nine thousand, two hundred fifty-three".