516621249 has 6 divisors (see below), whose sum is σ = 746230706. Its totient is φ = 344414160.

The previous prime is 516621223. The next prime is 516621253. The reversal of 516621249 is 942126615.

516621249 is a `hidden beast` number, since 5 + 1 + 6 + 621 + 24 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 432348849 + 84272400 = 20793^2 + 9180^2 .

It is not a de Polignac number, because 516621249 - 2¹³ = 516613057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (516626249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28701172 + ... + 28701189.

Almost surely, 2^516621249 is an apocalyptic number.

It is an amenable number.

516621249 is a deficient number, since it is larger than the sum of its proper divisors (229609457).

516621249 is a wasteful number, since it uses less digits than its factorization.

516621249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57402367 (or 57402364 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 516621249 is about 22729.3037508851. The cubic root of 516621249 is about 802.3996951525.

The spelling of 516621249 in words is "five hundred sixteen million, six hundred twenty-one thousand, two hundred forty-nine".