199742651 has 8 divisors (see below), whose sum is σ = 200889504. Its totient is φ = 198599680.

The previous prime is 199742623. The next prime is 199742659. The reversal of 199742651 is 156247991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199742651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199742659) 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 7 ways as a sum of consecutive naturals, for example, 202706 + ... + 203688.

It is an arithmetic number, because the mean of its divisors is an integer number (25111188).

Almost surely, 2^199742651 is an apocalyptic number.

199742651 is a deficient number, since it is larger than the sum of its proper divisors (1146853).

199742651 is an equidigital number, since it uses as much as digits as its factorization.

199742651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941.

The product of its digits is 136080, while the sum is 44.

The square root of 199742651 is about 14133.0340337806. The cubic root of 199742651 is about 584.5526089668.

The spelling of 199742651 in words is "one hundred ninety-nine million, seven hundred forty-two thousand, six hundred fifty-one".