619772509 has 2 divisors, whose sum is σ = 619772510. Its totient is φ = 619772508.

The previous prime is 619772507. The next prime is 619772551. The reversal of 619772509 is 905277916.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400880484 + 218892025 = 20022^2 + 14795^2 .

It is a cyclic number.

It is not a de Polignac number, because 619772509 - 2¹ = 619772507 is a prime.

Together with 619772507, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (619772501) 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, 309886254 + 309886255.

It is an arithmetic number, because the mean of its divisors is an integer number (309886255).

Almost surely, 2^619772509 is an apocalyptic number.

It is an amenable number.

619772509 is a deficient number, since it is larger than the sum of its proper divisors (1).

619772509 is an equidigital number, since it uses as much as digits as its factorization.

619772509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 619772509 is about 24895.2306476562. The cubic root of 619772509 is about 852.5975941681.

The spelling of 619772509 in words is "six hundred nineteen million, seven hundred seventy-two thousand, five hundred nine".