201690257 has 8 divisors (see below), whose sum is σ = 204190056. Its totient is φ = 199199232.

The previous prime is 201690199. The next prime is 201690271. The reversal of 201690257 is 752096102.

It can be written as a sum of positive squares in 4 ways, for example, as 4456321 + 197233936 = 2111^2 + 14044^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201690257 - 2¹⁰ = 201689233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201690277) 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, 52163 + ... + 55895.

It is an arithmetic number, because the mean of its divisors is an integer number (25523757).

Almost surely, 2^201690257 is an apocalyptic number.

It is an amenable number.

201690257 is a deficient number, since it is larger than the sum of its proper divisors (2499799).

201690257 is an equidigital number, since it uses as much as digits as its factorization.

201690257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4387.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 201690257 is about 14201.7695024247. The cubic root of 201690257 is about 586.4463754458.

The spelling of 201690257 in words is "two hundred one million, six hundred ninety thousand, two hundred fifty-seven".