511256705 has 4 divisors (see below), whose sum is σ = 613508052. Its totient is φ = 409005360.

The previous prime is 511256701. The next prime is 511256773. The reversal of 511256705 is 507652115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507652115 = 5 ⋅101530423.

It can be written as a sum of positive squares in 2 ways, for example, as 134003776 + 377252929 = 11576^2 + 19423^2 .

It is not a de Polignac number, because 511256705 - 2² = 511256701 is a prime.

It is a super-2 number, since 2×511256705² = 522766836814914050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (511256701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51125666 + ... + 51125675.

It is an arithmetic number, because the mean of its divisors is an integer number (153377013).

Almost surely, 2^511256705 is an apocalyptic number.

It is an amenable number.

511256705 is a deficient number, since it is larger than the sum of its proper divisors (102251347).

511256705 is a wasteful number, since it uses less digits than its factorization.

511256705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102251346.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 511256705 is about 22610.9863783073. The cubic root of 511256705 is about 799.6126796965.

The spelling of 511256705 in words is "five hundred eleven million, two hundred fifty-six thousand, seven hundred five".