609647021 has 2 divisors, whose sum is σ = 609647022. Its totient is φ = 609647020.

The previous prime is 609646987. The next prime is 609647099. The reversal of 609647021 is 120746906.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604471396 + 5175625 = 24586^2 + 2275^2 .

It is a cyclic number.

It is not a de Polignac number, because 609647021 - 2⁶ = 609646957 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609647921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304823510 + 304823511.

It is an arithmetic number, because the mean of its divisors is an integer number (304823511).

Almost surely, 2^609647021 is an apocalyptic number.

It is an amenable number.

609647021 is a deficient number, since it is larger than the sum of its proper divisors (1).

609647021 is an equidigital number, since it uses as much as digits as its factorization.

609647021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 609647021 is about 24691.0311854325. The cubic root of 609647021 is about 847.9289931978.

The spelling of 609647021 in words is "six hundred nine million, six hundred forty-seven thousand, twenty-one".