511545421 has 4 divisors (see below), whose sum is σ = 511592832. Its totient is φ = 511498012.

The previous prime is 511545409. The next prime is 511545427. The reversal of 511545421 is 124545115.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 511545421 - 2²³ = 503156813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 511545421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511545427) 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, 1206 + ... + 32008.

It is an arithmetic number, because the mean of its divisors is an integer number (127898208).

Almost surely, 2^511545421 is an apocalyptic number.

It is an amenable number.

511545421 is a deficient number, since it is larger than the sum of its proper divisors (47411).

511545421 is a wasteful number, since it uses less digits than its factorization.

511545421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47410.

The product of its digits is 4000, while the sum is 28.

The square root of 511545421 is about 22617.3698957239. The cubic root of 511545421 is about 799.7631700005.

The spelling of 511545421 in words is "five hundred eleven million, five hundred forty-five thousand, four hundred twenty-one".