1293130781 has 2 divisors, whose sum is σ = 1293130782. Its totient is φ = 1293130780.

The previous prime is 1293130763. The next prime is 1293130819. The reversal of 1293130781 is 1870313921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 943104100 + 350026681 = 30710^2 + 18709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1293130781 - 2¹⁸ = 1292868637 is a prime.

It is a super-2 number, since 2×1293130781² = 3344374433539339922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1293130681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 646565390 + 646565391.

It is an arithmetic number, because the mean of its divisors is an integer number (646565391).

Almost surely, 2^1293130781 is an apocalyptic number.

It is an amenable number.

1293130781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1293130781 is an equidigital number, since it uses as much as digits as its factorization.

1293130781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1293130781 is about 35960.1276555020. The cubic root of 1293130781 is about 1089.4671752633.

The spelling of 1293130781 in words is "one billion, two hundred ninety-three million, one hundred thirty thousand, seven hundred eighty-one".