51790327391 has 4 divisors (see below), whose sum is σ = 56498538984. Its totient is φ = 47082115800.

The previous prime is 51790327361. The next prime is 51790327403. The reversal of 51790327391 is 19372309715.

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 51790327391 - 2²⁶ = 51723218527 is a prime.

It is a super-2 number, since 2×51790327391² (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 (51790327361) 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, 2354105780 + ... + 2354105801.

It is an arithmetic number, because the mean of its divisors is an integer number (14124634746).

Almost surely, 2^51790327391 is an apocalyptic number.

51790327391 is a deficient number, since it is larger than the sum of its proper divisors (4708211593).

51790327391 is a wasteful number, since it uses less digits than its factorization.

51790327391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708211592.

The product of its (nonzero) digits is 357210, while the sum is 47.

The spelling of 51790327391 in words is "fifty-one billion, seven hundred ninety million, three hundred twenty-seven thousand, three hundred ninety-one".