352620521 has 16 divisors (see below), whose sum is σ = 408222720. Its totient is φ = 301416720.

The previous prime is 352620509. The next prime is 352620617. The reversal of 352620521 is 125026253.

It is a de Polignac number, because none of the positive numbers 2^k-352620521 is a prime.

It is a super-2 number, since 2×352620521² = 248682463660622882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (352620421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3116 + ... + 26738.

It is an arithmetic number, because the mean of its divisors is an integer number (25513920).

Almost surely, 2^352620521 is an apocalyptic number.

It is an amenable number.

352620521 is a deficient number, since it is larger than the sum of its proper divisors (55602199).

352620521 is a wasteful number, since it uses less digits than its factorization.

352620521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23716.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 352620521 is about 18778.1926979142. The cubic root of 352620521 is about 706.4843203375.

Adding to 352620521 its reverse (125026253), we get a palindrome (477646774).

The spelling of 352620521 in words is "three hundred fifty-two million, six hundred twenty thousand, five hundred twenty-one".