511525561 has 4 divisors (see below), whose sum is σ = 511583824. Its totient is φ = 511467300.

The previous prime is 511525541. The next prime is 511525583. The reversal of 511525561 is 165525115.

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 511525561 - 2¹⁹ = 511001273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511525541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12975 + ... + 34516.

It is an arithmetic number, because the mean of its divisors is an integer number (127895956).

Almost surely, 2^511525561 is an apocalyptic number.

It is an amenable number.

511525561 is a deficient number, since it is larger than the sum of its proper divisors (58263).

511525561 is a wasteful number, since it uses less digits than its factorization.

511525561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58262.

The product of its digits is 7500, while the sum is 31.

The square root of 511525561 is about 22616.9308483711. The cubic root of 511525561 is about 799.7528199896.

The spelling of 511525561 in words is "five hundred eleven million, five hundred twenty-five thousand, five hundred sixty-one".