198210451 has 4 divisors (see below), whose sum is σ = 208642600. Its totient is φ = 187778304.

The previous prime is 198210431. The next prime is 198210469. The reversal of 198210451 is 154012891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154012891 = 83 ⋅1855577.

It is a cyclic number.

It is not a de Polignac number, because 198210451 - 2¹¹ = 198208403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198210431) 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, 5216046 + ... + 5216083.

It is an arithmetic number, because the mean of its divisors is an integer number (52160650).

Almost surely, 2^198210451 is an apocalyptic number.

198210451 is a deficient number, since it is larger than the sum of its proper divisors (10432149).

198210451 is a wasteful number, since it uses less digits than its factorization.

198210451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10432148.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 198210451 is about 14078.7233441104. The cubic root of 198210451 is about 583.0540949955.

The spelling of 198210451 in words is "one hundred ninety-eight million, two hundred ten thousand, four hundred fifty-one".