401013521 has 4 divisors (see below), whose sum is σ = 403254000. Its totient is φ = 398773044.

The previous prime is 401013517. The next prime is 401013539. The reversal of 401013521 is 125310104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401013521 - 2² = 401013517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401013521.

It is not an unprimeable number, because it can be changed into a prime (401063521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1119971 + ... + 1120328.

It is an arithmetic number, because the mean of its divisors is an integer number (100813500).

Almost surely, 2^401013521 is an apocalyptic number.

It is an amenable number.

401013521 is a deficient number, since it is larger than the sum of its proper divisors (2240479).

401013521 is a wasteful number, since it uses less digits than its factorization.

401013521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240478.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 401013521 is about 20025.3219949143. The cubic root of 401013521 is about 737.4280820803.

Adding to 401013521 its reverse (125310104), we get a palindrome (526323625).

The spelling of 401013521 in words is "four hundred one million, thirteen thousand, five hundred twenty-one".