401155521 has 48 divisors (see below), whose sum is σ = 613663680. Its totient is φ = 231436800.

The previous prime is 401155501. The next prime is 401155523. The reversal of 401155521 is 125551104.

It is not a de Polignac number, because 401155521 - 2¹⁰ = 401154497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 401155491 and 401155500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401155523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1901106 + ... + 1901316.

It is an arithmetic number, because the mean of its divisors is an integer number (12784660).

Almost surely, 2^401155521 is an apocalyptic number.

401155521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

401155521 is a deficient number, since it is larger than the sum of its proper divisors (212508159).

401155521 is a wasteful number, since it uses less digits than its factorization.

401155521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 401155521 is about 20028.8671921305. The cubic root of 401155521 is about 737.5151135848.

The spelling of 401155521 in words is "four hundred one million, one hundred fifty-five thousand, five hundred twenty-one".