199861253 has 4 divisors (see below), whose sum is σ = 199889580. Its totient is φ = 199832928.

The previous prime is 199861241. The next prime is 199861267. The reversal of 199861253 is 352168991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 23980609 + 175880644 = 4897^2 + 13262^2 .

It is a cyclic number.

It is not a de Polignac number, because 199861253 - 2¹² = 199857157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199861213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801 + ... + 20817.

It is an arithmetic number, because the mean of its divisors is an integer number (49972395).

Almost surely, 2^199861253 is an apocalyptic number.

It is an amenable number.

199861253 is a deficient number, since it is larger than the sum of its proper divisors (28327).

199861253 is a wasteful number, since it uses less digits than its factorization.

199861253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28326.

The product of its digits is 116640, while the sum is 44.

The square root of 199861253 is about 14137.2293254371. The cubic root of 199861253 is about 584.6682834622.

The spelling of 199861253 in words is "one hundred ninety-nine million, eight hundred sixty-one thousand, two hundred fifty-three".