1540092396781 has 2 divisors, whose sum is σ = 1540092396782. Its totient is φ = 1540092396780.

The previous prime is 1540092396769. The next prime is 1540092396797. The reversal of 1540092396781 is 1876932900451.

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., 778513287556 + 761579109225 = 882334^2 + 872685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540092396781 - 2²³ = 1540084008173 is a prime.

It is a super-2 number, since 2×1540092396781² (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 (1540090396781) 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, 770046198390 + 770046198391.

It is an arithmetic number, because the mean of its divisors is an integer number (770046198391).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1540092396781 = 3080184793562, but 3⋅1540092396781 = 4620277190343 is not.

Almost surely, 2^{1540092396781} is an apocalyptic number.

It is an amenable number.

1540092396781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540092396781 is an equidigital number, since it uses as much as digits as its factorization.

1540092396781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 1540092396781 in words is "one trillion, five hundred forty billion, ninety-two million, three hundred ninety-six thousand, seven hundred eighty-one".