51313387749 has 16 divisors (see below), whose sum is σ = 73688596800. Its totient is φ = 31574111616.

The previous prime is 51313387739. The next prime is 51313387777. The reversal of 51313387749 is 94778331315.

It is a happy number.

It is not a de Polignac number, because 51313387749 - 2⁴ = 51313387733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51313387739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330537 + ... + 460305.

It is an arithmetic number, because the mean of its divisors is an integer number (4605537300).

Almost surely, 2^51313387749 is an apocalyptic number.

It is an amenable number.

51313387749 is a deficient number, since it is larger than the sum of its proper divisors (22375209051).

51313387749 is a wasteful number, since it uses less digits than its factorization.

51313387749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139924.

The product of its digits is 1905120, while the sum is 51.

The spelling of 51313387749 in words is "fifty-one billion, three hundred thirteen million, three hundred eighty-seven thousand, seven hundred forty-nine".