512369981 has 2 divisors, whose sum is σ = 512369982. Its totient is φ = 512369980.

The previous prime is 512369939. The next prime is 512369993. The reversal of 512369981 is 189963215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402644356 + 109725625 = 20066^2 + 10475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-512369981 is a prime.

It is a super-2 number, since 2×512369981² = 525045994859880722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512369881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256184990 + 256184991.

It is an arithmetic number, because the mean of its divisors is an integer number (256184991).

Almost surely, 2^512369981 is an apocalyptic number.

It is an amenable number.

512369981 is a deficient number, since it is larger than the sum of its proper divisors (1).

512369981 is an equidigital number, since it uses as much as digits as its factorization.

512369981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 512369981 is about 22635.5910238721. The cubic root of 512369981 is about 800.1926520403.

The spelling of 512369981 in words is "five hundred twelve million, three hundred sixty-nine thousand, nine hundred eighty-one".