1291788607487 has 16 divisors (see below), whose sum is σ = 1512417614400. Its totient is φ = 1080184392960.

The previous prime is 1291788607481. The next prime is 1291788607493. The reversal of 1291788607487 is 7847068871921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1291788607481) and next prime (1291788607493).

It is a cyclic number.

It is not a de Polignac number, because 1291788607487 - 2²⁶ = 1291721498623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291788607481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5858189 + ... + 6074697.

It is an arithmetic number, because the mean of its divisors is an integer number (94526100900).

Almost surely, 2^{1291788607487} is an apocalyptic number.

1291788607487 is a deficient number, since it is larger than the sum of its proper divisors (220629006913).

1291788607487 is a wasteful number, since it uses less digits than its factorization.

1291788607487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237346.

The product of its (nonzero) digits is 75866112, while the sum is 68.

The spelling of 1291788607487 in words is "one trillion, two hundred ninety-one billion, seven hundred eighty-eight million, six hundred seven thousand, four hundred eighty-seven".