207164561 has 4 divisors (see below), whose sum is σ = 207232752. Its totient is φ = 207096372.

The previous prime is 207164557. The next prime is 207164593. The reversal of 207164561 is 165461702.

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 207164561 - 2² = 207164557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (207104561) 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, 29315 + ... + 35688.

It is an arithmetic number, because the mean of its divisors is an integer number (51808188).

Almost surely, 2^207164561 is an apocalyptic number.

It is an amenable number.

207164561 is a deficient number, since it is larger than the sum of its proper divisors (68191).

207164561 is an equidigital number, since it uses as much as digits as its factorization.

207164561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68190.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 207164561 is about 14393.2123238699. The cubic root of 207164561 is about 591.7048849037.

The spelling of 207164561 in words is "two hundred seven million, one hundred sixty-four thousand, five hundred sixty-one".