199637157 has 4 divisors (see below), whose sum is σ = 266182880. Its totient is φ = 133091436.

The previous prime is 199637147. The next prime is 199637173. The reversal of 199637157 is 751736991.

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.

It is not a de Polignac number, because 199637157 - 2⁶ = 199637093 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 (199637147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33272857 + ... + 33272862.

It is an arithmetic number, because the mean of its divisors is an integer number (66545720).

Almost surely, 2^199637157 is an apocalyptic number.

It is an amenable number.

199637157 is a deficient number, since it is larger than the sum of its proper divisors (66545723).

199637157 is an equidigital number, since it uses as much as digits as its factorization.

199637157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66545722.

The product of its digits is 357210, while the sum is 48.

The square root of 199637157 is about 14129.3013627709. The cubic root of 199637157 is about 584.4496804364.

The spelling of 199637157 in words is "one hundred ninety-nine million, six hundred thirty-seven thousand, one hundred fifty-seven".