1779749497 has 2 divisors, whose sum is σ = 1779749498. Its totient is φ = 1779749496.

The previous prime is 1779749473. The next prime is 1779749509. The reversal of 1779749497 is 7949479771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1777128336 + 2621161 = 42156^2 + 1619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1779749497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1779741497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889874748 + 889874749.

It is an arithmetic number, because the mean of its divisors is an integer number (889874749).

Almost surely, 2^1779749497 is an apocalyptic number.

It is an amenable number.

1779749497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1779749497 is an equidigital number, since it uses as much as digits as its factorization.

1779749497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28005264, while the sum is 64.

The square root of 1779749497 is about 42187.0773697349. The cubic root of 1779749497 is about 1211.8614195356.

The spelling of 1779749497 in words is "one billion, seven hundred seventy-nine million, seven hundred forty-nine thousand, four hundred ninety-seven".