540123456791 has 4 divisors (see below), whose sum is σ = 541025166000. Its totient is φ = 539221747584.

The previous prime is 540123456779. The next prime is 540123456793. The reversal of 540123456791 is 197654321045.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 540123456791 - 2³⁸ = 265245549847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540123456793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450853706 + ... + 450854903.

It is an arithmetic number, because the mean of its divisors is an integer number (135256291500).

Almost surely, 2^540123456791 is an apocalyptic number.

540123456791 is a deficient number, since it is larger than the sum of its proper divisors (901709209).

540123456791 is an equidigital number, since it uses as much as digits as its factorization.

540123456791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901709208.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 540123456791 in words is "five hundred forty billion, one hundred twenty-three million, four hundred fifty-six thousand, seven hundred ninety-one".