164387261 has 2 divisors, whose sum is σ = 164387262. Its totient is φ = 164387260.

The previous prime is 164387257. The next prime is 164387281. The reversal of 164387261 is 162783461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155500900 + 8886361 = 12470^2 + 2981^2 .

It is a cyclic number.

It is not a de Polignac number, because 164387261 - 2² = 164387257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164387281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82193630 + 82193631.

It is an arithmetic number, because the mean of its divisors is an integer number (82193631).

Almost surely, 2^164387261 is an apocalyptic number.

It is an amenable number.

164387261 is a deficient number, since it is larger than the sum of its proper divisors (1).

164387261 is an equidigital number, since it uses as much as digits as its factorization.

164387261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 164387261 is about 12821.3595612946. The cubic root of 164387261 is about 547.8008726940.

The spelling of 164387261 in words is "one hundred sixty-four million, three hundred eighty-seven thousand, two hundred sixty-one".