199942513 has 8 divisors (see below), whose sum is σ = 201072200. Its totient is φ = 198816768.

The previous prime is 199942507. The next prime is 199942531. The reversal of 199942513 is 315249991.

It can be written as a sum of positive squares in 4 ways, for example, as 5702544 + 194239969 = 2388^2 + 13937^2 .

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-199942513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199942513.

It is not an unprimeable number, because it can be changed into a prime (199942543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176533 + ... + 177661.

It is an arithmetic number, because the mean of its divisors is an integer number (25134025).

Almost surely, 2^199942513 is an apocalyptic number.

It is an amenable number.

199942513 is a deficient number, since it is larger than the sum of its proper divisors (1129687).

199942513 is a wasteful number, since it uses less digits than its factorization.

199942513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971.

The product of its digits is 87480, while the sum is 43.

The square root of 199942513 is about 14140.1030052825. The cubic root of 199942513 is about 584.7475112707.

The spelling of 199942513 in words is "one hundred ninety-nine million, nine hundred forty-two thousand, five hundred thirteen".