521610641 has 4 divisors (see below), whose sum is σ = 524232000. Its totient is φ = 518989284.

The previous prime is 521610631. The next prime is 521610647. The reversal of 521610641 is 146016125.

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 521610641 - 2²² = 517416337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521610641.

It is not an unprimeable number, because it can be changed into a prime (521610647) 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, 1310381 + ... + 1310778.

It is an arithmetic number, because the mean of its divisors is an integer number (131058000).

Almost surely, 2^521610641 is an apocalyptic number.

It is an amenable number.

521610641 is a deficient number, since it is larger than the sum of its proper divisors (2621359).

521610641 is a wasteful number, since it uses less digits than its factorization.

521610641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621358.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 521610641 is about 22838.7968378371. The cubic root of 521610641 is about 804.9745454446.

Adding to 521610641 its reverse (146016125), we get a palindrome (667626766).

The spelling of 521610641 in words is "five hundred twenty-one million, six hundred ten thousand, six hundred forty-one".