251198 has 16 divisors (see below), whose sum is σ = 401760. Its totient is φ = 117600.

The previous prime is 251197. The next prime is 251201. The reversal of 251198 is 891152.

It is a happy number.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 251198.

It is not an unprimeable number, because it can be changed into a prime (251191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3503 + ... + 3573.

It is an arithmetic number, because the mean of its divisors is an integer number (25110).

2²⁵¹¹⁹⁸ is an apocalyptic number.

251198 is a deficient number, since it is larger than the sum of its proper divisors (150562).

251198 is a wasteful number, since it uses less digits than its factorization.

251198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163.

The product of its digits is 720, while the sum is 26.

The square root of 251198 is about 501.1965682245. The cubic root of 251198 is about 63.0965178830.

The spelling of 251198 in words is "two hundred fifty-one thousand, one hundred ninety-eight".