511433261 has 4 divisors (see below), whose sum is σ = 511654812. Its totient is φ = 511211712.

The previous prime is 511433243. The next prime is 511433269. The reversal of 511433261 is 162334115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100600900 + 410832361 = 10030^2 + 20269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511433261 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 511433261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511433269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107276 + ... + 111941.

It is an arithmetic number, because the mean of its divisors is an integer number (127913703).

Almost surely, 2^511433261 is an apocalyptic number.

It is an amenable number.

511433261 is a deficient number, since it is larger than the sum of its proper divisors (221551).

511433261 is a wasteful number, since it uses less digits than its factorization.

511433261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221550.

The product of its digits is 2160, while the sum is 26.

The square root of 511433261 is about 22614.8902495679. The cubic root of 511433261 is about 799.7047144590.

Adding to 511433261 its reverse (162334115), we get a palindrome (673767376).

The spelling of 511433261 in words is "five hundred eleven million, four hundred thirty-three thousand, two hundred sixty-one".