198581461 has 4 divisors (see below), whose sum is σ = 213856972. Its totient is φ = 183305952.

The previous prime is 198581447. The next prime is 198581477. The reversal of 198581461 is 164185891.

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 27102436 + 171479025 = 5206^2 + 13095^2 .

It is a cyclic number.

It is not a de Polignac number, because 198581461 - 2²⁵ = 165027029 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 (198581261) 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, 7637736 + ... + 7637761.

It is an arithmetic number, because the mean of its divisors is an integer number (53464243).

Almost surely, 2^198581461 is an apocalyptic number.

It is an amenable number.

198581461 is a deficient number, since it is larger than the sum of its proper divisors (15275511).

198581461 is a wasteful number, since it uses less digits than its factorization.

198581461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15275510.

The product of its digits is 69120, while the sum is 43.

The square root of 198581461 is about 14091.8934497817. The cubic root of 198581461 is about 583.4176548220.

The spelling of 198581461 in words is "one hundred ninety-eight million, five hundred eighty-one thousand, four hundred sixty-one".