201890657 has 4 divisors (see below), whose sum is σ = 213766596. Its totient is φ = 190014720.

The previous prime is 201890639. The next prime is 201890669. The reversal of 201890657 is 756098102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756098102 = 2 ⋅378049051.

It can be written as a sum of positive squares in 2 ways, for example, as 138274081 + 63616576 = 11759^2 + 7976^2 .

It is a cyclic number.

It is not a de Polignac number, because 201890657 - 2⁸ = 201890401 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 201890657.

It is not an unprimeable number, because it can be changed into a prime (201890057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5937944 + ... + 5937977.

It is an arithmetic number, because the mean of its divisors is an integer number (53441649).

Almost surely, 2^201890657 is an apocalyptic number.

It is an amenable number.

201890657 is a deficient number, since it is larger than the sum of its proper divisors (11875939).

201890657 is a wasteful number, since it uses less digits than its factorization.

201890657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11875938.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 201890657 is about 14208.8232095413. The cubic root of 201890657 is about 586.6405427345.

The spelling of 201890657 in words is "two hundred one million, eight hundred ninety thousand, six hundred fifty-seven".