164551399 has 2 divisors, whose sum is σ = 164551400. Its totient is φ = 164551398.

The previous prime is 164551369. The next prime is 164551403. The reversal of 164551399 is 993155461.

It is a strong prime.

It is an emirp because it is prime and its reverse (993155461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164551399 - 2¹¹ = 164549351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164551319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82275699 + 82275700.

It is an arithmetic number, because the mean of its divisors is an integer number (82275700).

Almost surely, 2^164551399 is an apocalyptic number.

164551399 is a deficient number, since it is larger than the sum of its proper divisors (1).

164551399 is an equidigital number, since it uses as much as digits as its factorization.

164551399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 43.

The square root of 164551399 is about 12827.7589235221. The cubic root of 164551399 is about 547.9831354588.

The spelling of 164551399 in words is "one hundred sixty-four million, five hundred fifty-one thousand, three hundred ninety-nine".