1294991729 has 2 divisors, whose sum is σ = 1294991730. Its totient is φ = 1294991728.

The previous prime is 1294991713. The next prime is 1294991743. The reversal of 1294991729 is 9271994921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995528704 + 299463025 = 31552^2 + 17305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1294991729 - 2⁴ = 1294991713 is a prime.

It is a super-3 number, since 3×1294991729³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1294951729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647495864 + 647495865.

It is an arithmetic number, because the mean of its divisors is an integer number (647495865).

Almost surely, 2^1294991729 is an apocalyptic number.

It is an amenable number.

1294991729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1294991729 is an equidigital number, since it uses as much as digits as its factorization.

1294991729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The square root of 1294991729 is about 35985.9935113649. The cubic root of 1294991729 is about 1089.9895431480.

The spelling of 1294991729 in words is "one billion, two hundred ninety-four million, nine hundred ninety-one thousand, seven hundred twenty-nine".