198915261 has 8 divisors (see below), whose sum is σ = 266008704. Its totient is φ = 132216000.

The previous prime is 198915259. The next prime is 198915271. The reversal of 198915261 is 162519891.

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

It is not a de Polignac number, because 198915261 - 2¹ = 198915259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198915221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97365 + ... + 99386.

It is an arithmetic number, because the mean of its divisors is an integer number (33251088).

Almost surely, 2^198915261 is an apocalyptic number.

It is an amenable number.

198915261 is a deficient number, since it is larger than the sum of its proper divisors (67093443).

198915261 is a wasteful number, since it uses less digits than its factorization.

198915261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197091.

The product of its digits is 38880, while the sum is 42.

The square root of 198915261 is about 14103.7321656362. The cubic root of 198915261 is about 583.7443650748.

It can be divided in two parts, 19891 and 5261, that added together give a palindrome (25152).

The spelling of 198915261 in words is "one hundred ninety-eight million, nine hundred fifteen thousand, two hundred sixty-one".