512540421 has 4 divisors (see below), whose sum is σ = 683387232. Its totient is φ = 341693612.

The previous prime is 512540417. The next prime is 512540471. The reversal of 512540421 is 124045215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 512540421 - 2² = 512540417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 512540391 and 512540400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512540411) 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, 85423401 + ... + 85423406.

It is an arithmetic number, because the mean of its divisors is an integer number (170846808).

Almost surely, 2^512540421 is an apocalyptic number.

It is an amenable number.

512540421 is a deficient number, since it is larger than the sum of its proper divisors (170846811).

512540421 is a wasteful number, since it uses less digits than its factorization.

512540421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170846810.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 512540421 is about 22639.3555782845. The cubic root of 512540421 is about 800.2813702977.

Adding to 512540421 its reverse (124045215), we get a palindrome (636585636).

The spelling of 512540421 in words is "five hundred twelve million, five hundred forty thousand, four hundred twenty-one".