919057649 has 2 divisors, whose sum is σ = 919057650. Its totient is φ = 919057648.

The previous prime is 919057631. The next prime is 919057679. The reversal of 919057649 is 946750919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837697249 + 81360400 = 28943^2 + 9020^2 .

It is an emirp because it is prime and its reverse (946750919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919057649 - 2²⁴ = 902280433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 919057597 and 919057606.

It is not a weakly prime, because it can be changed into another prime (919057609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459528824 + 459528825.

It is an arithmetic number, because the mean of its divisors is an integer number (459528825).

Almost surely, 2^919057649 is an apocalyptic number.

It is an amenable number.

919057649 is a deficient number, since it is larger than the sum of its proper divisors (1).

919057649 is an equidigital number, since it uses as much as digits as its factorization.

919057649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 919057649 is about 30315.9636000573. The cubic root of 919057649 is about 972.2566402913.

The spelling of 919057649 in words is "nine hundred nineteen million, fifty-seven thousand, six hundred forty-nine".