510609981 has 12 divisors (see below), whose sum is σ = 778230176. Its totient is φ = 291717960.

The previous prime is 510609937. The next prime is 510609991. The reversal of 510609981 is 189906015.

It is not a de Polignac number, because 510609981 - 2⁶ = 510609917 is a prime.

It is a super-2 number, since 2×510609981² = 521445105393640722, 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 (510609991) 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, 101086 + ... + 106016.

Almost surely, 2^510609981 is an apocalyptic number.

It is an amenable number.

510609981 is a deficient number, since it is larger than the sum of its proper divisors (267620195).

510609981 is an frugal number, since it uses more digits than its factorization.

510609981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9872 (or 4941 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 510609981 is about 22596.6807518272. The cubic root of 510609981 is about 799.2753756184.

The spelling of 510609981 in words is "five hundred ten million, six hundred nine thousand, nine hundred eighty-one".