1219390657 has 2 divisors, whose sum is σ = 1219390658. Its totient is φ = 1219390656.

The previous prime is 1219390631. The next prime is 1219390681. The reversal of 1219390657 is 7560939121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1075774401 + 143616256 = 32799^2 + 11984^2 .

It is an emirp because it is prime and its reverse (7560939121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219390657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1219390357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609695328 + 609695329.

It is an arithmetic number, because the mean of its divisors is an integer number (609695329).

Almost surely, 2^1219390657 is an apocalyptic number.

It is an amenable number.

1219390657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219390657 is an equidigital number, since it uses as much as digits as its factorization.

1219390657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 1219390657 is about 34919.7745840376. The cubic root of 1219390657 is about 1068.3518040447.

It can be divided in two parts, 1219 and 390657, that added together give a square (391876 = 626²).

The spelling of 1219390657 in words is "one billion, two hundred nineteen million, three hundred ninety thousand, six hundred fifty-seven".