199142957 has 4 divisors (see below), whose sum is σ = 214461660. Its totient is φ = 183824256.

The previous prime is 199142939. The next prime is 199142959. The reversal of 199142957 is 759241991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 127554436 + 71588521 = 11294^2 + 8461^2 .

It is a cyclic number.

It is not a de Polignac number, because 199142957 - 2¹⁴ = 199126573 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 (199142959) 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, 7659332 + ... + 7659357.

It is an arithmetic number, because the mean of its divisors is an integer number (53615415).

Almost surely, 2^199142957 is an apocalyptic number.

It is an amenable number.

199142957 is a deficient number, since it is larger than the sum of its proper divisors (15318703).

199142957 is a wasteful number, since it uses less digits than its factorization.

199142957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15318702.

The product of its digits is 204120, while the sum is 47.

The square root of 199142957 is about 14111.8020465141. The cubic root of 199142957 is about 583.9670152838.

The spelling of 199142957 in words is "one hundred ninety-nine million, one hundred forty-two thousand, nine hundred fifty-seven".