51211320535 has 16 divisors (see below), whose sum is σ = 61952740416. Its totient is φ = 40637196288.

The previous prime is 51211320493. The next prime is 51211320553. The reversal of 51211320535 is 53502311215.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51211320535 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396414 + ... + 509476.

It is an arithmetic number, because the mean of its divisors is an integer number (3872046276).

Almost surely, 2^51211320535 is an apocalyptic number.

51211320535 is a deficient number, since it is larger than the sum of its proper divisors (10741419881).

51211320535 is a wasteful number, since it uses less digits than its factorization.

51211320535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113802.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 51211320535 in words is "fifty-one billion, two hundred eleven million, three hundred twenty thousand, five hundred thirty-five".