1290539797 has 2 divisors, whose sum is σ = 1290539798. Its totient is φ = 1290539796.

The previous prime is 1290539791. The next prime is 1290539849. The reversal of 1290539797 is 7979350921.

It is an a-pointer prime, because the next prime (1290539849) can be obtained adding 1290539797 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1113490161 + 177049636 = 33369^2 + 13306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290539797 - 2¹⁹ = 1290015509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290539791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645269898 + 645269899.

It is an arithmetic number, because the mean of its divisors is an integer number (645269899).

Almost surely, 2^1290539797 is an apocalyptic number.

It is an amenable number.

1290539797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290539797 is an equidigital number, since it uses as much as digits as its factorization.

1290539797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1071630, while the sum is 52.

The square root of 1290539797 is about 35924.0838018174. The cubic root of 1290539797 is about 1088.7390510704.

The spelling of 1290539797 in words is "one billion, two hundred ninety million, five hundred thirty-nine thousand, seven hundred ninety-seven".