51986371097 has 4 divisors (see below), whose sum is σ = 52005161856. Its totient is φ = 51967580340.

The previous prime is 51986371061. The next prime is 51986371117. The reversal of 51986371097 is 79017368915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79017368915 = 5 ⋅15803473783.

It is a cyclic number.

It is not a de Polignac number, because 51986371097 - 2⁶ = 51986371033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51986371027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9391229 + ... + 9396762.

It is an arithmetic number, because the mean of its divisors is an integer number (13001290464).

Almost surely, 2^51986371097 is an apocalyptic number.

It is an amenable number.

51986371097 is a deficient number, since it is larger than the sum of its proper divisors (18790759).

51986371097 is a wasteful number, since it uses less digits than its factorization.

51986371097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18790758.

The product of its (nonzero) digits is 2857680, while the sum is 56.

The spelling of 51986371097 in words is "fifty-one billion, nine hundred eighty-six million, three hundred seventy-one thousand, ninety-seven".