511421231 has 4 divisors (see below), whose sum is σ = 523314792. Its totient is φ = 499527672.

The previous prime is 511421203. The next prime is 511421311. The reversal of 511421231 is 132124115.

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

It is a cyclic number.

It is not a de Polignac number, because 511421231 - 2¹⁸ = 511159087 is a prime.

It is a super-2 number, since 2×511421231² = 523103351035110722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511421201) 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, 5946716 + ... + 5946801.

It is an arithmetic number, because the mean of its divisors is an integer number (130828698).

Almost surely, 2^511421231 is an apocalyptic number.

511421231 is a deficient number, since it is larger than the sum of its proper divisors (11893561).

511421231 is a wasteful number, since it uses less digits than its factorization.

511421231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11893560.

The product of its digits is 240, while the sum is 20.

The square root of 511421231 is about 22614.6242728019. The cubic root of 511421231 is about 799.6984441569.

Adding to 511421231 its reverse (132124115), we get a palindrome (643545346).

The spelling of 511421231 in words is "five hundred eleven million, four hundred twenty-one thousand, two hundred thirty-one".