401316521 has 2 divisors, whose sum is σ = 401316522. Its totient is φ = 401316520.

The previous prime is 401316511. The next prime is 401316563. The reversal of 401316521 is 125613104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337236496 + 64080025 = 18364^2 + 8005^2 .

It is a cyclic number.

It is not a de Polignac number, because 401316521 - 2¹⁸ = 401054377 is a prime.

It is a super-2 number, since 2×401316521² = 322109900055086882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (401316511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200658260 + 200658261.

It is an arithmetic number, because the mean of its divisors is an integer number (200658261).

Almost surely, 2^401316521 is an apocalyptic number.

It is an amenable number.

401316521 is a deficient number, since it is larger than the sum of its proper divisors (1).

401316521 is an equidigital number, since it uses as much as digits as its factorization.

401316521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 401316521 is about 20032.8859877952. The cubic root of 401316521 is about 737.6137653092.

Adding to 401316521 its reverse (125613104), we get a palindrome (526929625).

The spelling of 401316521 in words is "four hundred one million, three hundred sixteen thousand, five hundred twenty-one".