168427521 has 12 divisors (see below), whose sum is σ = 243617920. Its totient is φ = 112131000.

The previous prime is 168427513. The next prime is 168427531. The reversal of 168427521 is 125724861.

It is not a de Polignac number, because 168427521 - 2³ = 168427513 is a prime.

It is a super-3 number, since 3×168427521³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168427531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5701 + ... + 19218.

It is a Proth number, since it is equal to 1285 ⋅ 2¹⁷ + 1 and 1285 < 2¹⁷.

Almost surely, 2^168427521 is an apocalyptic number.

It is an amenable number.

168427521 is a deficient number, since it is larger than the sum of its proper divisors (75190399).

168427521 is a wasteful number, since it uses less digits than its factorization.

168427521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25676 (or 25673 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 168427521 is about 12977.9628986987. The cubic root of 168427521 is about 552.2524935773.

The spelling of 168427521 in words is "one hundred sixty-eight million, four hundred twenty-seven thousand, five hundred twenty-one".