651423 has 16 divisors (see below), whose sum is σ = 940896. Its totient is φ = 399360.

The previous prime is 651401. The next prime is 651437. The reversal of 651423 is 324156.

It is a happy number.

It is not a de Polignac number, because 651423 - 2⁹ = 650911 is a prime.

651423 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 651423.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651423.

It is not an unprimeable number, because it can be changed into a prime (651473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2583 + ... + 2823.

It is an arithmetic number, because the mean of its divisors is an integer number (58806).

2⁶⁵¹⁴²³ is an apocalyptic number.

651423 is a deficient number, since it is larger than the sum of its proper divisors (289473).

651423 is a wasteful number, since it uses less digits than its factorization.

651423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314.

The product of its digits is 720, while the sum is 21.

The square root of 651423 is about 807.1077994915. The cubic root of 651423 is about 86.6870777041.

Adding to 651423 its reverse (324156), we get a palindrome (975579).

The spelling of 651423 in words is "six hundred fifty-one thousand, four hundred twenty-three".