511381 has 8 divisors (see below), whose sum is σ = 556640. Its totient is φ = 466992.

The previous prime is 511361. The next prime is 511387. The reversal of 511381 is 183115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 511381 - 2¹⁷ = 380309 is a prime.

It is a super-2 number, since 2×511381² = 523021054322, 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 (511387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1666 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (69580).

2⁵¹¹³⁸¹ is an apocalyptic number.

It is an amenable number.

511381 is a deficient number, since it is larger than the sum of its proper divisors (45259).

511381 is a wasteful number, since it uses less digits than its factorization.

511381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435.

The product of its digits is 120, while the sum is 19.

The square root of 511381 is about 715.1090825881. The cubic root of 511381 is about 79.9677474155.

Adding to 511381 its reverse (183115), we get a palindrome (694496).

The spelling of 511381 in words is "five hundred eleven thousand, three hundred eighty-one".