201996857 has 4 divisors (see below), whose sum is σ = 202025460. Its totient is φ = 201968256.

The previous prime is 201996829. The next prime is 201996863. The reversal of 201996857 is 758699102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 126585001 + 75411856 = 11251^2 + 8684^2 .

It is a cyclic number.

It is not a de Polignac number, because 201996857 - 2⁶ = 201996793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201990857) 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, 4769 + ... + 20657.

It is an arithmetic number, because the mean of its divisors is an integer number (50506365).

Almost surely, 2^201996857 is an apocalyptic number.

It is an amenable number.

201996857 is a deficient number, since it is larger than the sum of its proper divisors (28603).

201996857 is a wasteful number, since it uses less digits than its factorization.

201996857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28602.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 201996857 is about 14212.5598327676. The cubic root of 201996857 is about 586.7433876865.

The spelling of 201996857 in words is "two hundred one million, nine hundred ninety-six thousand, eight hundred fifty-seven".