168513225 has 24 divisors (see below), whose sum is σ = 279794592. Its totient is φ = 89491200.

The previous prime is 168513181. The next prime is 168513307. The reversal of 168513225 is 522315861.

It is not a de Polignac number, because 168513225 - 2⁶ = 168513161 is a prime.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 13414 + ... + 22736.

It is an arithmetic number, because the mean of its divisors is an integer number (11658108).

Almost surely, 2^168513225 is an apocalyptic number.

168513225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168513225 is a deficient number, since it is larger than the sum of its proper divisors (111281367).

168513225 is a wasteful number, since it uses less digits than its factorization.

168513225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9577 (or 9572 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 168513225 is about 12981.2643837186. The cubic root of 168513225 is about 552.3461485448.

The spelling of 168513225 in words is "one hundred sixty-eight million, five hundred thirteen thousand, two hundred twenty-five".