512219981 has 12 divisors (see below), whose sum is σ = 641682972. Its totient is φ = 405272448.

The previous prime is 512219969. The next prime is 512220017. The reversal of 512219981 is 189912215.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 164994025 + 347225956 = 12845^2 + 18634^2 .

It is not a de Polignac number, because 512219981 - 2¹⁰ = 512218957 is a prime.

It is a super-2 number, since 2×512219981² = 524738617871280722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512219921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 401420 + ... + 402693.

It is an arithmetic number, because the mean of its divisors is an integer number (53473581).

Almost surely, 2^512219981 is an apocalyptic number.

It is an amenable number.

512219981 is a deficient number, since it is larger than the sum of its proper divisors (129462991).

512219981 is a wasteful number, since it uses less digits than its factorization.

512219981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804140 (or 804133 counting only the distinct ones).

The product of its digits is 12960, while the sum is 38.

The square root of 512219981 is about 22632.2774152315. The cubic root of 512219981 is about 800.1145570326.

The spelling of 512219981 in words is "five hundred twelve million, two hundred nineteen thousand, nine hundred eighty-one".