516909981 has 16 divisors (see below), whose sum is σ = 821919744. Its totient is φ = 282534384.

The previous prime is 516909979. The next prime is 516909983. The reversal of 516909981 is 189909615.

It is an interprime number because it is at equal distance from previous prime (516909979) and next prime (516909983).

It is not a de Polignac number, because 516909981 - 2¹ = 516909979 is a prime.

It is a super-2 number, since 2×516909981² = 534391856914840722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 516909981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516909983) 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, 534621 + ... + 535586.

It is an arithmetic number, because the mean of its divisors is an integer number (51369984).

Almost surely, 2^516909981 is an apocalyptic number.

It is an amenable number.

516909981 is a deficient number, since it is larger than the sum of its proper divisors (305009763).

516909981 is a wasteful number, since it uses less digits than its factorization.

516909981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070240.

The product of its (nonzero) digits is 174960, while the sum is 48.

The square root of 516909981 is about 22735.6544000827. The cubic root of 516909981 is about 802.5491504334.

The spelling of 516909981 in words is "five hundred sixteen million, nine hundred nine thousand, nine hundred eighty-one".