103525821 has 24 divisors (see below), whose sum is σ = 171188160. Its totient is φ = 59057856.

The previous prime is 103525789. The next prime is 103525837. The reversal of 103525821 is 128525301.

It is a happy number.

It is not a de Polignac number, because 103525821 - 2⁵ = 103525789 is a prime.

It is a super-2 number, since 2×103525821² = 21435191227448082, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103525841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53161 + ... + 55073.

It is an arithmetic number, because the mean of its divisors is an integer number (7132840).

Almost surely, 2^103525821 is an apocalyptic number.

It is an amenable number.

103525821 is a deficient number, since it is larger than the sum of its proper divisors (67662339).

103525821 is a wasteful number, since it uses less digits than its factorization.

103525821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785 (or 2782 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 103525821 is about 10174.7639284654. The cubic root of 103525821 is about 469.5511347572.

The spelling of 103525821 in words is "one hundred three million, five hundred twenty-five thousand, eight hundred twenty-one".