511421 has 4 divisors (see below), whose sum is σ = 515292. Its totient is φ = 507552.

The previous prime is 511417. The next prime is 511439. The reversal of 511421 is 124115.

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 290521 + 220900 = 539^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 511421 - 2² = 511417 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 511396 and 511405.

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 511421.

It is not an unprimeable number, because it can be changed into a prime (516421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1730 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (128823).

2⁵¹¹⁴²¹ is an apocalyptic number.

It is an amenable number.

511421 is a deficient number, since it is larger than the sum of its proper divisors (3871).

511421 is a wasteful number, since it uses less digits than its factorization.

511421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3870.

The product of its digits is 40, while the sum is 14.

The square root of 511421 is about 715.1370498023. The cubic root of 511421 is about 79.9698323754.

Adding to 511421 its reverse (124115), we get a palindrome (635536).

The spelling of 511421 in words is "five hundred eleven thousand, four hundred twenty-one".