641450521 has 2 divisors, whose sum is σ = 641450522. Its totient is φ = 641450520.

The previous prime is 641450461. The next prime is 641450569. The reversal of 641450521 is 125054146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595360000 + 46090521 = 24400^2 + 6789^2 .

It is a cyclic number.

It is not a de Polignac number, because 641450521 - 2⁹ = 641450009 is a prime.

It is a super-2 number, since 2×641450521² = 822917541782342882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641450521.

It is not a weakly prime, because it can be changed into another prime (641450591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320725260 + 320725261.

It is an arithmetic number, because the mean of its divisors is an integer number (320725261).

Almost surely, 2^641450521 is an apocalyptic number.

It is an amenable number.

641450521 is a deficient number, since it is larger than the sum of its proper divisors (1).

641450521 is an equidigital number, since it uses as much as digits as its factorization.

641450521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 641450521 is about 25326.8734943735. The cubic root of 641450521 is about 862.4244374326.

The spelling of 641450521 in words is "six hundred forty-one million, four hundred fifty thousand, five hundred twenty-one".