51001540511 has 4 divisors (see below), whose sum is σ = 51067519992. Its totient is φ = 50935561032.

The previous prime is 51001540483. The next prime is 51001540517. The reversal of 51001540511 is 11504510015.

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 51001540511 - 2¹⁰ = 51001539487 is a prime.

It is a super-2 number, since 2×51001540511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51001540517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32988581 + ... + 32990126.

It is an arithmetic number, because the mean of its divisors is an integer number (12766879998).

Almost surely, 2^51001540511 is an apocalyptic number.

51001540511 is a deficient number, since it is larger than the sum of its proper divisors (65979481).

51001540511 is an equidigital number, since it uses as much as digits as its factorization.

51001540511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65979480.

The product of its (nonzero) digits is 500, while the sum is 23.

The spelling of 51001540511 in words is "fifty-one billion, one million, five hundred forty thousand, five hundred eleven".