641030591 has 2 divisors, whose sum is σ = 641030592. Its totient is φ = 641030590.

The previous prime is 641030563. The next prime is 641030597. The reversal of 641030591 is 195030146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641030591 - 2⁶ = 641030527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641030597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320515295 + 320515296.

It is an arithmetic number, because the mean of its divisors is an integer number (320515296).

Almost surely, 2^641030591 is an apocalyptic number.

641030591 is a deficient number, since it is larger than the sum of its proper divisors (1).

641030591 is an equidigital number, since it uses as much as digits as its factorization.

641030591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 641030591 is about 25318.5819310640. The cubic root of 641030591 is about 862.2361989842.

The spelling of 641030591 in words is "six hundred forty-one million, thirty thousand, five hundred ninety-one".