199900761 has 4 divisors (see below), whose sum is σ = 266534352. Its totient is φ = 133267172.

The previous prime is 199900759. The next prime is 199900763. The reversal of 199900761 is 167009991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167009991 = 3 ⋅55669997.

It is an interprime number because it is at equal distance from previous prime (199900759) and next prime (199900763).

It is a cyclic number.

It is not a de Polignac number, because 199900761 - 2¹ = 199900759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199900763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33316791 + ... + 33316796.

It is an arithmetic number, because the mean of its divisors is an integer number (66633588).

Almost surely, 2^199900761 is an apocalyptic number.

It is an amenable number.

199900761 is a deficient number, since it is larger than the sum of its proper divisors (66633591).

199900761 is an equidigital number, since it uses as much as digits as its factorization.

199900761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66633590.

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 199900761 is about 14138.6265598890. The cubic root of 199900761 is about 584.7068061078.

It can be divided in two parts, 199900 and 761, that added together give a triangular number (200661 = T₆₃₃).

The spelling of 199900761 in words is "one hundred ninety-nine million, nine hundred thousand, seven hundred sixty-one".