126731040511 has 4 divisors (see below), whose sum is σ = 130819138624. Its totient is φ = 122642942400.

The previous prime is 126731040487. The next prime is 126731040517. The reversal of 126731040511 is 115040137621.

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 126731040511 - 2¹⁷ = 126730909439 is a prime.

It is a super-2 number, since 2×126731040511² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 4088098081 = 126731040511 / (1 + 2 + 6 + 7 + 3 + 1 + 0 + 4 + 0 + 5 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126731040517) 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, 2044049010 + ... + 2044049071.

It is an arithmetic number, because the mean of its divisors is an integer number (32704784656).

Almost surely, 2^126731040511 is an apocalyptic number.

126731040511 is a deficient number, since it is larger than the sum of its proper divisors (4088098113).

126731040511 is an equidigital number, since it uses as much as digits as its factorization.

126731040511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088098112.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 126731040511 in words is "one hundred twenty-six billion, seven hundred thirty-one million, forty thousand, five hundred eleven".