651941 has 4 divisors (see below), whose sum is σ = 667884. Its totient is φ = 636000.

The previous prime is 651913. The next prime is 651943. The reversal of 651941 is 149156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 372100 + 279841 = 610^2 + 529^2 .

It is a cyclic number.

It is not a de Polignac number, because 651941 - 2⁶ = 651877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 651941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7910 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (166971).

2⁶⁵¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

651941 is a deficient number, since it is larger than the sum of its proper divisors (15943).

651941 is a wasteful number, since it uses less digits than its factorization.

651941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15942.

The product of its digits is 1080, while the sum is 26.

The square root of 651941 is about 807.4286346173. The cubic root of 651941 is about 86.7100489579.

The spelling of 651941 in words is "six hundred fifty-one thousand, nine hundred forty-one".