198162861 has 32 divisors (see below), whose sum is σ = 295706880. Its totient is φ = 117241344.

The previous prime is 198162851. The next prime is 198162901. The reversal of 198162861 is 168261891.

It is not a de Polignac number, because 198162861 - 2²² = 193968557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198162851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127656 + ... + 129198.

It is an arithmetic number, because the mean of its divisors is an integer number (9240840).

Almost surely, 2^198162861 is an apocalyptic number.

It is an amenable number.

198162861 is a deficient number, since it is larger than the sum of its proper divisors (97544019).

198162861 is a wasteful number, since it uses less digits than its factorization.

198162861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685.

The product of its digits is 41472, while the sum is 42.

The square root of 198162861 is about 14077.0331036053. The cubic root of 198162861 is about 583.0074278206.

The spelling of 198162861 in words is "one hundred ninety-eight million, one hundred sixty-two thousand, eight hundred sixty-one".