1540043778631 has 2 divisors, whose sum is σ = 1540043778632. Its totient is φ = 1540043778630.

The previous prime is 1540043778617. The next prime is 1540043778659. The reversal of 1540043778631 is 1368773400451.

It is a weak prime.

It is an emirp because it is prime and its reverse (1368773400451) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540043778631 is a prime.

It is a super-2 number, since 2×1540043778631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540043775631) 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 as a sum of consecutive naturals, namely, 770021889315 + 770021889316.

It is an arithmetic number, because the mean of its divisors is an integer number (770021889316).

Almost surely, 2^{1540043778631} is an apocalyptic number.

1540043778631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540043778631 is an equidigital number, since it uses as much as digits as its factorization.

1540043778631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 1540043778631 in words is "one trillion, five hundred forty billion, forty-three million, seven hundred seventy-eight thousand, six hundred thirty-one".