1291415028765 has 16 divisors (see below), whose sum is σ = 2132917725696. Its totient is φ = 666536788800.

The previous prime is 1291415028763. The next prime is 1291415028769. The reversal of 1291415028765 is 5678205141921.

It is not a de Polignac number, because 1291415028765 - 2¹ = 1291415028763 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291415028763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1388617846 + ... + 1388618775.

It is an arithmetic number, because the mean of its divisors is an integer number (133307357856).

Almost surely, 2^{1291415028765} is an apocalyptic number.

1291415028765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1291415028765 is a deficient number, since it is larger than the sum of its proper divisors (841502696931).

1291415028765 is a wasteful number, since it uses less digits than its factorization.

1291415028765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777236660.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 1291415028765 in words is "one trillion, two hundred ninety-one billion, four hundred fifteen million, twenty-eight thousand, seven hundred sixty-five".