401006521 has 4 divisors (see below), whose sum is σ = 403891600. Its totient is φ = 398121444.

The previous prime is 401006513. The next prime is 401006549. The reversal of 401006521 is 125600104.

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 401006521 - 2³ = 401006513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401006581) 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, 1442331 + ... + 1442608.

It is an arithmetic number, because the mean of its divisors is an integer number (100972900).

Almost surely, 2^401006521 is an apocalyptic number.

It is an amenable number.

401006521 is a deficient number, since it is larger than the sum of its proper divisors (2885079).

401006521 is a wasteful number, since it uses less digits than its factorization.

401006521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885078.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 401006521 is about 20025.1472154389. The cubic root of 401006521 is about 737.4237912635.

Adding to 401006521 its reverse (125600104), we get a palindrome (526606625).

The spelling of 401006521 in words is "four hundred one million, six thousand, five hundred twenty-one".