511656985 has 32 divisors (see below), whose sum is σ = 740678400. Its totient is φ = 331464960.

The previous prime is 511656983. The next prime is 511656989. The reversal of 511656985 is 589656115.

It is not a de Polignac number, because 511656985 - 2¹ = 511656983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (511656983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305731 + ... + 307399.

It is an arithmetic number, because the mean of its divisors is an integer number (23146200).

Almost surely, 2^511656985 is an apocalyptic number.

It is an amenable number.

511656985 is a deficient number, since it is larger than the sum of its proper divisors (229021415).

511656985 is a wasteful number, since it uses less digits than its factorization.

511656985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161.

The product of its digits is 324000, while the sum is 46.

The square root of 511656985 is about 22619.8360957811. The cubic root of 511656985 is about 799.8213064429.

The spelling of 511656985 in words is "five hundred eleven million, six hundred fifty-six thousand, nine hundred eighty-five".