17961121 has 8 divisors (see below), whose sum is σ = 19180800. Its totient is φ = 16781520.

The previous prime is 17961113. The next prime is 17961131. The reversal of 17961121 is 12116971.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 17961121 - 2³ = 17961113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17961121.

It is not an unprimeable number, because it can be changed into a prime (17961131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9091 + ... + 10888.

It is an arithmetic number, because the mean of its divisors is an integer number (2397600).

Almost surely, 2^17961121 is an apocalyptic number.

It is an amenable number.

17961121 is a deficient number, since it is larger than the sum of its proper divisors (1219679).

17961121 is a wasteful number, since it uses less digits than its factorization.

17961121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20039.

The product of its digits is 756, while the sum is 28.

The square root of 17961121 is about 4238.0562761719. The cubic root of 17961121 is about 261.8853148782.

The spelling of 17961121 in words is "seventeen million, nine hundred sixty-one thousand, one hundred twenty-one".