201678601 has 4 divisors (see below), whose sum is σ = 207129412. Its totient is φ = 196227792.

The previous prime is 201678577. The next prime is 201678613. The reversal of 201678601 is 106876102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80568576 + 121110025 = 8976^2 + 11005^2 .

It is a cyclic number.

It is not a de Polignac number, because 201678601 - 2⁵ = 201678569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201678641) 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, 2725350 + ... + 2725423.

It is an arithmetic number, because the mean of its divisors is an integer number (51782353).

Almost surely, 2^201678601 is an apocalyptic number.

It is an amenable number.

201678601 is a deficient number, since it is larger than the sum of its proper divisors (5450811).

201678601 is an equidigital number, since it uses as much as digits as its factorization.

201678601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5450810.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 201678601 is about 14201.3591250979. The cubic root of 201678601 is about 586.4350780059.

The spelling of 201678601 in words is "two hundred one million, six hundred seventy-eight thousand, six hundred one".