609795981 has 12 divisors (see below), whose sum is σ = 881270208. Its totient is φ = 406321224.

The previous prime is 609795973. The next prime is 609795983. The reversal of 609795981 is 189597906.

It is not a de Polignac number, because 609795981 - 2³ = 609795973 is a prime.

It is a super-2 number, since 2×609795981² = 743702276887504722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609795983) 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, 2146 + ... + 34988.

It is an arithmetic number, because the mean of its divisors is an integer number (73439184).

Almost surely, 2^609795981 is an apocalyptic number.

It is an amenable number.

609795981 is a deficient number, since it is larger than the sum of its proper divisors (271474227).

609795981 is a wasteful number, since it uses less digits than its factorization.

609795981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34912 (or 34909 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 609795981 is about 24694.0474811239. The cubic root of 609795981 is about 847.9980480294.

The spelling of 609795981 in words is "six hundred nine million, seven hundred ninety-five thousand, nine hundred eighty-one".