331401521 has 4 divisors (see below), whose sum is σ = 361528944. Its totient is φ = 301274100.

The previous prime is 331401491. The next prime is 331401523. The reversal of 331401521 is 125104133.

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 331401521 - 2¹⁸ = 331139377 is a prime.

It is a super-2 number, since 2×331401521² = 219653936242226882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331401493 and 331401502.

It is not an unprimeable number, because it can be changed into a prime (331401523) 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, 15063695 + ... + 15063716.

It is an arithmetic number, because the mean of its divisors is an integer number (90382236).

Almost surely, 2^331401521 is an apocalyptic number.

It is an amenable number.

331401521 is a deficient number, since it is larger than the sum of its proper divisors (30127423).

331401521 is a wasteful number, since it uses less digits than its factorization.

331401521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30127422.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 331401521 is about 18204.4368492958. The cubic root of 331401521 is about 692.0192345718.

Adding to 331401521 its reverse (125104133), we get a palindrome (456505654).

The spelling of 331401521 in words is "three hundred thirty-one million, four hundred one thousand, five hundred twenty-one".