198167861 has 4 divisors (see below), whose sum is σ = 209824812. Its totient is φ = 186510912.

The previous prime is 198167831. The next prime is 198167863. The reversal of 198167861 is 168761891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168761891 = 307 ⋅549713.

It can be written as a sum of positive squares in 2 ways, for example, as 179720836 + 18447025 = 13406^2 + 4295^2 .

It is a cyclic number.

It is not a de Polignac number, because 198167861 - 2¹⁴ = 198151477 is a prime.

It is a super-2 number, since 2×198167861² = 78541002266630642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198167863) 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, 5828450 + ... + 5828483.

It is an arithmetic number, because the mean of its divisors is an integer number (52456203).

Almost surely, 2^198167861 is an apocalyptic number.

It is an amenable number.

198167861 is a deficient number, since it is larger than the sum of its proper divisors (11656951).

198167861 is a wasteful number, since it uses less digits than its factorization.

198167861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11656950.

The product of its digits is 145152, while the sum is 47.

The square root of 198167861 is about 14077.2106967254. The cubic root of 198167861 is about 583.0123312160.

The spelling of 198167861 in words is "one hundred ninety-eight million, one hundred sixty-seven thousand, eight hundred sixty-one".