201564501 has 4 divisors (see below), whose sum is σ = 268752672. Its totient is φ = 134376332.

The previous prime is 201564497. The next prime is 201564533. The reversal of 201564501 is 105465102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201564501 - 2² = 201564497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201564551) 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, 33594081 + ... + 33594086.

It is an arithmetic number, because the mean of its divisors is an integer number (67188168).

Almost surely, 2^201564501 is an apocalyptic number.

It is an amenable number.

201564501 is a deficient number, since it is larger than the sum of its proper divisors (67188171).

201564501 is an equidigital number, since it uses as much as digits as its factorization.

201564501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67188170.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 201564501 is about 14197.3413356163. The cubic root of 201564501 is about 586.3244649404.

The spelling of 201564501 in words is "two hundred one million, five hundred sixty-four thousand, five hundred one".