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198451 = 1118041

198451 has 4 divisors (see below), whose sum is σ = 216504. Its totient is φ = 180400.

The previous prime is 198439. The next prime is 198461. The reversal of 198451 is 154891.

It can be divided in two parts, 198 and 451, that multiplied together give a palindrome (89298).

It is a happy number.

198451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154891 = 1114081.

It is not a de Polignac number, because 198451 - 27 = 198323 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (198461) 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, 9010 + ... + 9031.

It is an arithmetic number, because the mean of its divisors is an integer number (54126).

2198451 is an apocalyptic number.

198451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198451 is a deficient number, since it is larger than the sum of its proper divisors (18053).

198451 is a wasteful number, since it uses less digits than its factorization.

198451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18052.

The product of its digits is 1440, while the sum is 28.

The square root of 198451 is about 445.4783945378. The cubic root of 198451 is about 58.3289865242.

The spelling of 198451 in words is "one hundred ninety-eight thousand, four hundred fifty-one".

Divisors: 1 11 18041 198451