1318790497 has 2 divisors, whose sum is σ = 1318790498. Its totient is φ = 1318790496.

The previous prime is 1318790443. The next prime is 1318790509. The reversal of 1318790497 is 7940978131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 835845921 + 482944576 = 28911^2 + 21976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318790497 - 2¹⁵ = 1318757729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1318790497.

It is not a weakly prime, because it can be changed into another prime (1318791497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659395248 + 659395249.

It is an arithmetic number, because the mean of its divisors is an integer number (659395249).

Almost surely, 2^1318790497 is an apocalyptic number.

It is an amenable number.

1318790497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318790497 is an equidigital number, since it uses as much as digits as its factorization.

1318790497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 1318790497 is about 36315.1551972451. The cubic root of 1318790497 is about 1096.6261631531.

It can be divided in two parts, 13187 and 90497, that added together give a square (103684 = 322²).

The spelling of 1318790497 in words is "one billion, three hundred eighteen million, seven hundred ninety thousand, four hundred ninety-seven".