516647381 has 8 divisors (see below), whose sum is σ = 519278424. Its totient is φ = 514022400.

The previous prime is 516647377. The next prime is 516647387. The reversal of 516647381 is 183746615.

It can be written as a sum of positive squares in 4 ways, for example, as 74218225 + 442429156 = 8615^2 + 21034^2 .

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 516647381 - 2² = 516647377 is a prime.

It is a super-2 number, since 2×516647381² = 533849032588318322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516647387) 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, 331901 + ... + 333453.

It is an arithmetic number, because the mean of its divisors is an integer number (64909803).

Almost surely, 2^516647381 is an apocalyptic number.

It is an amenable number.

516647381 is a deficient number, since it is larger than the sum of its proper divisors (2631043).

516647381 is a wasteful number, since it uses less digits than its factorization.

516647381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031.

The product of its digits is 120960, while the sum is 41.

The square root of 516647381 is about 22729.8785962442. The cubic root of 516647381 is about 802.4132240549.

The spelling of 516647381 in words is "five hundred sixteen million, six hundred forty-seven thousand, three hundred eighty-one".