755644609 has 2 divisors, whose sum is σ = 755644610. Its totient is φ = 755644608.

The previous prime is 755644607. The next prime is 755644613. The reversal of 755644609 is 906446557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755150400 + 494209 = 27480^2 + 703^2 .

It is an emirp because it is prime and its reverse (906446557) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 755644609 - 2¹ = 755644607 is a prime.

It is a super-2 number, since 2×755644609² = 1141997550221525762, which contains 22 as substring.

Together with 755644607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (755644607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 377822304 + 377822305.

It is an arithmetic number, because the mean of its divisors is an integer number (377822305).

Almost surely, 2^755644609 is an apocalyptic number.

It is an amenable number.

755644609 is a deficient number, since it is larger than the sum of its proper divisors (1).

755644609 is an equidigital number, since it uses as much as digits as its factorization.

755644609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 755644609 is about 27488.9906871824. The cubic root of 755644609 is about 910.8339209886.

The spelling of 755644609 in words is "seven hundred fifty-five million, six hundred forty-four thousand, six hundred nine".