511252561 has 8 divisors (see below), whose sum is σ = 516152520. Its totient is φ = 506376192.

The previous prime is 511252559. The next prime is 511252583. The reversal of 511252561 is 165252115.

It can be written as a sum of positive squares in 4 ways, for example, as 9492561 + 501760000 = 3081^2 + 22400^2 .

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 511252561 - 2¹ = 511252559 is a prime.

It is a super-2 number, since 2×511252561² = 522758362258117442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511252501) 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, 39285 + ... + 50653.

It is an arithmetic number, because the mean of its divisors is an integer number (64519065).

Almost surely, 2^511252561 is an apocalyptic number.

It is an amenable number.

511252561 is a deficient number, since it is larger than the sum of its proper divisors (4899959).

511252561 is a wasteful number, since it uses less digits than its factorization.

511252561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11795.

The product of its digits is 3000, while the sum is 28.

The square root of 511252561 is about 22610.8947412525. The cubic root of 511252561 is about 799.6105192659.

The spelling of 511252561 in words is "five hundred eleven million, two hundred fifty-two thousand, five hundred sixty-one".