512972681 has 4 divisors (see below), whose sum is σ = 552432132. Its totient is φ = 473513232.

The previous prime is 512972641. The next prime is 512972683. The reversal of 512972681 is 186279215.

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 309197056 + 203775625 = 17584^2 + 14275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-512972681 is a prime.

It is a super-2 number, since 2×512972681² = 526281942904655522, 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 (512972683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19729706 + ... + 19729731.

It is an arithmetic number, because the mean of its divisors is an integer number (138108033).

Almost surely, 2^512972681 is an apocalyptic number.

It is an amenable number.

512972681 is a deficient number, since it is larger than the sum of its proper divisors (39459451).

512972681 is a wasteful number, since it uses less digits than its factorization.

512972681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39459450.

The product of its digits is 60480, while the sum is 41.

The square root of 512972681 is about 22648.9002161253. The cubic root of 512972681 is about 800.5062842153.

The spelling of 512972681 in words is "five hundred twelve million, nine hundred seventy-two thousand, six hundred eighty-one".