201897657 has 64 divisors (see below), whose sum is σ = 341107200. Its totient is φ = 117089280.

The previous prime is 201897649. The next prime is 201897673. The reversal of 201897657 is 756798102.

It is not a de Polignac number, because 201897657 - 2³ = 201897649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201897607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 718357 + ... + 718637.

It is an arithmetic number, because the mean of its divisors is an integer number (5329800).

Almost surely, 2^201897657 is an apocalyptic number.

201897657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

201897657 is a deficient number, since it is larger than the sum of its proper divisors (139209543).

201897657 is a wasteful number, since it uses less digits than its factorization.

201897657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 201897657 is about 14209.0695332242. The cubic root of 201897657 is about 586.6473227021.

The spelling of 201897657 in words is "two hundred one million, eight hundred ninety-seven thousand, six hundred fifty-seven".