650591 has 2 divisors, whose sum is σ = 650592. Its totient is φ = 650590.

The previous prime is 650581. The next prime is 650599. The reversal of 650591 is 195056.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 650591 - 2¹⁰ = 649567 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 650591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325295 + 325296.

It is an arithmetic number, because the mean of its divisors is an integer number (325296).

2⁶⁵⁰⁵⁹¹ is an apocalyptic number.

650591 is a deficient number, since it is larger than the sum of its proper divisors (1).

650591 is an equidigital number, since it uses as much as digits as its factorization.

650591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 650591 is about 806.5922141950. The cubic root of 650591 is about 86.6501562895.

Subtracting from 650591 its reverse (195056), we obtain a triangular number (455535 = T₉₅₄).

The spelling of 650591 in words is "six hundred fifty thousand, five hundred ninety-one".