51193508197 has 8 divisors (see below), whose sum is σ = 56171687544. Its totient is φ = 46363931328.

The previous prime is 51193508147. The next prime is 51193508207. The reversal of 51193508197 is 79180539115.

It can be written as a sum of positive squares in 4 ways, for example, as 226382116 + 50967126081 = 15046^2 + 225759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51193508197 - 2¹¹ = 51193506149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51193508197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51193508147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37149898 + ... + 37151275.

It is an arithmetic number, because the mean of its divisors is an integer number (7021460943).

Almost surely, 2^51193508197 is an apocalyptic number.

It is an amenable number.

51193508197 is a deficient number, since it is larger than the sum of its proper divisors (4978179347).

51193508197 is a wasteful number, since it uses less digits than its factorization.

51193508197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74301239.

The product of its (nonzero) digits is 340200, while the sum is 49.

The spelling of 51193508197 in words is "fifty-one billion, one hundred ninety-three million, five hundred eight thousand, one hundred ninety-seven".