651841 has 2 divisors, whose sum is σ = 651842. Its totient is φ = 651840.

The previous prime is 651839. The next prime is 651853. The reversal of 651841 is 148156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 18225 = 796^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 651841 - 2¹ = 651839 is a prime.

Together with 651839, it forms a pair of twin primes.

651841 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (651811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325920 + 325921.

It is an arithmetic number, because the mean of its divisors is an integer number (325921).

2⁶⁵¹⁸⁴¹ is an apocalyptic number.

It is an amenable number.

651841 is a deficient number, since it is larger than the sum of its proper divisors (1).

651841 is an equidigital number, since it uses as much as digits as its factorization.

651841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 25.

The square root of 651841 is about 807.3667072650. The cubic root of 651841 is about 86.7056153009.

Adding to 651841 its reverse (148156), we get a palindrome (799997).

The spelling of 651841 in words is "six hundred fifty-one thousand, eight hundred forty-one".