401552521 has 4 divisors (see below), whose sum is σ = 401659972. Its totient is φ = 401445072.

The previous prime is 401552491. The next prime is 401552581. The reversal of 401552521 is 125255104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32490000 + 369062521 = 5700^2 + 19211^2 .

It is a cyclic number.

It is not a de Polignac number, because 401552521 - 2¹³ = 401544329 is a prime.

It is a super-2 number, since 2×401552521² = 322488854242910882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401552581) 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 3 ways as a sum of consecutive naturals, for example, 47910 + ... + 55663.

It is an arithmetic number, because the mean of its divisors is an integer number (100414993).

Almost surely, 2^401552521 is an apocalyptic number.

It is an amenable number.

401552521 is a deficient number, since it is larger than the sum of its proper divisors (107451).

401552521 is a wasteful number, since it uses less digits than its factorization.

401552521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107450.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 401552521 is about 20038.7754366378. The cubic root of 401552521 is about 737.7583251332.

The spelling of 401552521 in words is "four hundred one million, five hundred fifty-two thousand, five hundred twenty-one".