198698291 has 4 divisors (see below), whose sum is σ = 216761784. Its totient is φ = 180634800.

The previous prime is 198698287. The next prime is 198698309. The reversal of 198698291 is 192896891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192896891 = 11 ⋅17536081.

It is a cyclic number.

It is not a de Polignac number, because 198698291 - 2² = 198698287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198698221) 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, 9031730 + ... + 9031751.

It is an arithmetic number, because the mean of its divisors is an integer number (54190446).

Almost surely, 2^198698291 is an apocalyptic number.

198698291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198698291 is a deficient number, since it is larger than the sum of its proper divisors (18063493).

198698291 is a wasteful number, since it uses less digits than its factorization.

198698291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18063492.

The product of its digits is 559872, while the sum is 53.

The square root of 198698291 is about 14096.0381313332. The cubic root of 198698291 is about 583.5320450271.

The spelling of 198698291 in words is "one hundred ninety-eight million, six hundred ninety-eight thousand, two hundred ninety-one".