198869761 has 4 divisors (see below), whose sum is σ = 198901332. Its totient is φ = 198838192.

The previous prime is 198869719. The next prime is 198869767. The reversal of 198869761 is 167968891.

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 87778161 + 111091600 = 9369^2 + 10540^2 .

It is a cyclic number.

It is not a de Polignac number, because 198869761 - 2¹⁵ = 198836993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198869767) 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, 2746 + ... + 20131.

It is an arithmetic number, because the mean of its divisors is an integer number (49725333).

Almost surely, 2^198869761 is an apocalyptic number.

It is an amenable number.

198869761 is a deficient number, since it is larger than the sum of its proper divisors (31571).

198869761 is an equidigital number, since it uses as much as digits as its factorization.

198869761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31570.

The product of its digits is 1306368, while the sum is 55.

The square root of 198869761 is about 14102.1190251678. The cubic root of 198869761 is about 583.6998529982.

The spelling of 198869761 in words is "one hundred ninety-eight million, eight hundred sixty-nine thousand, seven hundred sixty-one".