201688945 has 8 divisors (see below), whose sum is σ = 249834240. Its totient is φ = 156146160.

The previous prime is 201688931. The next prime is 201688957. The reversal of 201688945 is 549886102.

It is a happy number.

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

It is not a de Polignac number, because 201688945 - 2¹³ = 201680753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650455 + ... + 650764.

It is an arithmetic number, because the mean of its divisors is an integer number (31229280).

Almost surely, 2^201688945 is an apocalyptic number.

It is an amenable number.

201688945 is a deficient number, since it is larger than the sum of its proper divisors (48145295).

201688945 is a wasteful number, since it uses less digits than its factorization.

201688945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301255.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 201688945 is about 14201.7233109225. The cubic root of 201688945 is about 586.4451038271.

The spelling of 201688945 in words is "two hundred one million, six hundred eighty-eight thousand, nine hundred forty-five".