164035561 has 2 divisors, whose sum is σ = 164035562. Its totient is φ = 164035560.

The previous prime is 164035549. The next prime is 164035589. The reversal of 164035561 is 165530461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160174336 + 3861225 = 12656^2 + 1965^2 .

It is an emirp because it is prime and its reverse (165530461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164035561 - 2¹⁵ = 164002793 is a prime.

It is not a weakly prime, because it can be changed into another prime (164035061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82017780 + 82017781.

It is an arithmetic number, because the mean of its divisors is an integer number (82017781).

Almost surely, 2^164035561 is an apocalyptic number.

It is an amenable number.

164035561 is a deficient number, since it is larger than the sum of its proper divisors (1).

164035561 is an equidigital number, since it uses as much as digits as its factorization.

164035561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 164035561 is about 12807.6368233956. The cubic root of 164035561 is about 547.4099277053.

The spelling of 164035561 in words is "one hundred sixty-four million, thirty-five thousand, five hundred sixty-one".