641524409 has 2 divisors, whose sum is σ = 641524410. Its totient is φ = 641524408.

The previous prime is 641524369. The next prime is 641524421. The reversal of 641524409 is 904425146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570493225 + 71031184 = 23885^2 + 8428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641524409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641520409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320762204 + 320762205.

It is an arithmetic number, because the mean of its divisors is an integer number (320762205).

Almost surely, 2^641524409 is an apocalyptic number.

It is an amenable number.

641524409 is a deficient number, since it is larger than the sum of its proper divisors (1).

641524409 is an equidigital number, since it uses as much as digits as its factorization.

641524409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 641524409 is about 25328.3321401153. The cubic root of 641524409 is about 862.4575500777.

The spelling of 641524409 in words is "six hundred forty-one million, five hundred twenty-four thousand, four hundred nine".