404102521 has 2 divisors, whose sum is σ = 404102522. Its totient is φ = 404102520.

The previous prime is 404102483. The next prime is 404102533. The reversal of 404102521 is 125201404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397005625 + 7096896 = 19925^2 + 2664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404102521 is a prime.

It is not a weakly prime, because it can be changed into another prime (404102561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202051260 + 202051261.

It is an arithmetic number, because the mean of its divisors is an integer number (202051261).

Almost surely, 2^404102521 is an apocalyptic number.

It is an amenable number.

404102521 is a deficient number, since it is larger than the sum of its proper divisors (1).

404102521 is an equidigital number, since it uses as much as digits as its factorization.

404102521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 404102521 is about 20102.3013856623. The cubic root of 404102521 is about 739.3167061250.

Adding to 404102521 its reverse (125201404), we get a palindrome (529303925).

The spelling of 404102521 in words is "four hundred four million, one hundred two thousand, five hundred twenty-one".