51940338291 has 8 divisors (see below), whose sum is σ = 76948649360. Its totient is φ = 34626892176.

The previous prime is 51940338269. The next prime is 51940338343. The reversal of 51940338291 is 19283304915.

It is a happy number.

51940338291 is a `hidden beast` number, since 519 + 40 + 3 + 3 + 8 + 2 + 91 = 666.

It is not a de Polignac number, because 51940338291 - 2¹⁵ = 51940305523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51940338251) 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 in 7 ways as a sum of consecutive naturals, for example, 961858090 + ... + 961858143.

It is an arithmetic number, because the mean of its divisors is an integer number (9618581170).

Almost surely, 2^51940338291 is an apocalyptic number.

51940338291 is a deficient number, since it is larger than the sum of its proper divisors (25008311069).

51940338291 is a wasteful number, since it uses less digits than its factorization.

51940338291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923716242 (or 1923716236 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 51940338291 in words is "fifty-one billion, nine hundred forty million, three hundred thirty-eight thousand, two hundred ninety-one".