198726261 has 4 divisors (see below), whose sum is σ = 264968352. Its totient is φ = 132484172.

The previous prime is 198726259. The next prime is 198726271. The reversal of 198726261 is 162627891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198726261 - 2¹ = 198726259 is a prime.

It is a super-2 number, since 2×198726261² = 78984253622080242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198726211) 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, 33121041 + ... + 33121046.

It is an arithmetic number, because the mean of its divisors is an integer number (66242088).

Almost surely, 2^198726261 is an apocalyptic number.

It is an amenable number.

198726261 is a deficient number, since it is larger than the sum of its proper divisors (66242091).

198726261 is an equidigital number, since it uses as much as digits as its factorization.

198726261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66242090.

The product of its digits is 72576, while the sum is 42.

The square root of 198726261 is about 14097.0302191632. The cubic root of 198726261 is about 583.5594242686.

The spelling of 198726261 in words is "one hundred ninety-eight million, seven hundred twenty-six thousand, two hundred sixty-one".