641122521 has 16 divisors (see below), whose sum is σ = 926243136. Its totient is φ = 392112576.

The previous prime is 641122511. The next prime is 641122541. The reversal of 641122521 is 125221146.

It is not a de Polignac number, because 641122521 - 2¹⁰ = 641121497 is a prime.

It is a super-2 number, since 2×641122521² = 822076173866790882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641122491 and 641122500.

It is not an unprimeable number, because it can be changed into a prime (641122511) 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, 44070 + ... + 56783.

It is an arithmetic number, because the mean of its divisors is an integer number (57890196).

Almost surely, 2^641122521 is an apocalyptic number.

It is an amenable number.

641122521 is a deficient number, since it is larger than the sum of its proper divisors (285120615).

641122521 is a wasteful number, since it uses less digits than its factorization.

641122521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101032.

The product of its digits is 960, while the sum is 24.

The square root of 641122521 is about 25320.3973310057. The cubic root of 641122521 is about 862.2774146901.

Adding to 641122521 its reverse (125221146), we get a palindrome (766343667).

The spelling of 641122521 in words is "six hundred forty-one million, one hundred twenty-two thousand, five hundred twenty-one".