651449 has 4 divisors (see below), whose sum is σ = 667380. Its totient is φ = 635520.

The previous prime is 651439. The next prime is 651461. The reversal of 651449 is 944156.

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 78400 + 573049 = 280^2 + 757^2 .

It is a cyclic number.

It is not a de Polignac number, because 651449 - 2⁸ = 651193 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651449.

It is not an unprimeable number, because it can be changed into a prime (651439) 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, 7904 + ... + 7985.

It is an arithmetic number, because the mean of its divisors is an integer number (166845).

2⁶⁵¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

651449 is a deficient number, since it is larger than the sum of its proper divisors (15931).

651449 is a wasteful number, since it uses less digits than its factorization.

651449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15930.

The product of its digits is 4320, while the sum is 29.

The square root of 651449 is about 807.1239062251. The cubic root of 651449 is about 86.6882309916.

The spelling of 651449 in words is "six hundred fifty-one thousand, four hundred forty-nine".