516471781 has 16 divisors (see below), whose sum is σ = 635575680. Its totient is φ = 409582080.

The previous prime is 516471731. The next prime is 516471797. The reversal of 516471781 is 187174615.

It is a cyclic number.

It is not a de Polignac number, because 516471781 - 2⁷ = 516471653 is a prime.

It is a super-2 number, since 2×516471781² = 533486201138623922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516471721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29760 + ... + 43801.

It is an arithmetic number, because the mean of its divisors is an integer number (39723480).

Almost surely, 2^516471781 is an apocalyptic number.

It is an amenable number.

516471781 is a deficient number, since it is larger than the sum of its proper divisors (119103899).

516471781 is a wasteful number, since it uses less digits than its factorization.

516471781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73644.

The product of its digits is 47040, while the sum is 40.

The square root of 516471781 is about 22726.0155108633. The cubic root of 516471781 is about 802.3223047071.

The spelling of 516471781 in words is "five hundred sixteen million, four hundred seventy-one thousand, seven hundred eighty-one".