651439 has 2 divisors, whose sum is σ = 651440. Its totient is φ = 651438.

The previous prime is 651437. The next prime is 651461. The reversal of 651439 is 934156.

651439 = 327² + 328² + ... + 332².

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651439 - 2¹ = 651437 is a prime.

Together with 651437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325719 + 325720.

It is an arithmetic number, because the mean of its divisors is an integer number (325720).

2⁶⁵¹⁴³⁹ is an apocalyptic number.

651439 is a deficient number, since it is larger than the sum of its proper divisors (1).

651439 is an equidigital number, since it uses as much as digits as its factorization.

651439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 651439 is about 807.1177113656. The cubic root of 651439 is about 86.6877874231.

The spelling of 651439 in words is "six hundred fifty-one thousand, four hundred thirty-nine".