199157507 has 4 divisors (see below), whose sum is σ = 199224480. Its totient is φ = 199090536.

The previous prime is 199157503. The next prime is 199157513. The reversal of 199157507 is 705751991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199157507 - 2² = 199157503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199157501) 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, 28808 + ... + 35045.

It is an arithmetic number, because the mean of its divisors is an integer number (49806120).

Almost surely, 2^199157507 is an apocalyptic number.

199157507 is a deficient number, since it is larger than the sum of its proper divisors (66973).

199157507 is an equidigital number, since it uses as much as digits as its factorization.

199157507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66972.

The product of its (nonzero) digits is 99225, while the sum is 44.

The square root of 199157507 is about 14112.3175630369. The cubic root of 199157507 is about 583.9812370825.

The spelling of 199157507 in words is "one hundred ninety-nine million, one hundred fifty-seven thousand, five hundred seven".