609676981 has 2 divisors, whose sum is σ = 609676982. Its totient is φ = 609676980.

The previous prime is 609676957. The next prime is 609676993. The reversal of 609676981 is 189676906.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551780100 + 57896881 = 23490^2 + 7609^2 .

It is a cyclic number.

It is not a de Polignac number, because 609676981 - 2¹⁹ = 609152693 is a prime.

It is a super-2 number, since 2×609676981² = 743412042322548722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609676931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304838490 + 304838491.

It is an arithmetic number, because the mean of its divisors is an integer number (304838491).

Almost surely, 2^609676981 is an apocalyptic number.

It is an amenable number.

609676981 is a deficient number, since it is larger than the sum of its proper divisors (1).

609676981 is an equidigital number, since it uses as much as digits as its factorization.

609676981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 609676981 is about 24691.6378760098. The cubic root of 609676981 is about 847.9428829491.

The spelling of 609676981 in words is "six hundred nine million, six hundred seventy-six thousand, nine hundred eighty-one".