51249197099 has 24 divisors (see below), whose sum is σ = 53815385232. Its totient is φ = 48785405760.

The previous prime is 51249197053. The next prime is 51249197143. The reversal of 51249197099 is 99079194215.

It is a de Polignac number, because none of the positive numbers 2^k-51249197099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51249197029) 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 23 ways as a sum of consecutive naturals, for example, 15383864 + ... + 15387194.

It is an arithmetic number, because the mean of its divisors is an integer number (2242307718).

Almost surely, 2^51249197099 is an apocalyptic number.

51249197099 is a deficient number, since it is larger than the sum of its proper divisors (2566188133).

51249197099 is a wasteful number, since it uses less digits than its factorization.

51249197099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627 (or 3584 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 56.

The spelling of 51249197099 in words is "fifty-one billion, two hundred forty-nine million, one hundred ninety-seven thousand, ninety-nine".