165421453 has 2 divisors, whose sum is σ = 165421454. Its totient is φ = 165421452.

The previous prime is 165421433. The next prime is 165421457. The reversal of 165421453 is 354124561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98148649 + 67272804 = 9907^2 + 8202^2 .

It is a cyclic number.

It is not a de Polignac number, because 165421453 - 2¹⁷ = 165290381 is a prime.

It is a super-2 number, since 2×165421453² = 54728514225262418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165421457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82710726 + 82710727.

It is an arithmetic number, because the mean of its divisors is an integer number (82710727).

Almost surely, 2^165421453 is an apocalyptic number.

It is an amenable number.

165421453 is a deficient number, since it is larger than the sum of its proper divisors (1).

165421453 is an equidigital number, since it uses as much as digits as its factorization.

165421453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

The square root of 165421453 is about 12861.6271521142. The cubic root of 165421453 is about 548.9472457142.

The spelling of 165421453 in words is "one hundred sixty-five million, four hundred twenty-one thousand, four hundred fifty-three".