609820649 has 2 divisors, whose sum is σ = 609820650. Its totient is φ = 609820648.

The previous prime is 609820621. The next prime is 609820669. The reversal of 609820649 is 946028906.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549058624 + 60762025 = 23432^2 + 7795^2 .

It is a cyclic number.

It is not a de Polignac number, because 609820649 - 2²⁴ = 593043433 is a prime.

It is not a weakly prime, because it can be changed into another prime (609820609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304910324 + 304910325.

It is an arithmetic number, because the mean of its divisors is an integer number (304910325).

Almost surely, 2^609820649 is an apocalyptic number.

It is an amenable number.

609820649 is a deficient number, since it is larger than the sum of its proper divisors (1).

609820649 is an equidigital number, since it uses as much as digits as its factorization.

609820649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 609820649 is about 24694.5469486686. The cubic root of 609820649 is about 848.0094825279.

The spelling of 609820649 in words is "six hundred nine million, eight hundred twenty thousand, six hundred forty-nine".