609648869 has 2 divisors, whose sum is σ = 609648870. Its totient is φ = 609648868.

The previous prime is 609648859. The next prime is 609648887. The reversal of 609648869 is 968846906.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504586369 + 105062500 = 22463^2 + 10250^2 .

It is a cyclic number.

It is not a de Polignac number, because 609648869 - 2¹⁶ = 609583333 is a prime.

It is a super-2 number, since 2×609648869² = 743343486945958322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609648859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304824434 + 304824435.

It is an arithmetic number, because the mean of its divisors is an integer number (304824435).

Almost surely, 2^609648869 is an apocalyptic number.

It is an amenable number.

609648869 is a deficient number, since it is larger than the sum of its proper divisors (1).

609648869 is an equidigital number, since it uses as much as digits as its factorization.

609648869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The square root of 609648869 is about 24691.0686078995. The cubic root of 609648869 is about 847.9298499620.

The spelling of 609648869 in words is "six hundred nine million, six hundred forty-eight thousand, eight hundred sixty-nine".