51313216409 has 32 divisors (see below), whose sum is σ = 64964008704. Its totient is φ = 39452417280.

The previous prime is 51313216393. The next prime is 51313216433. The reversal of 51313216409 is 90461231315.

51313216409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51313216409 - 2⁴ = 51313216393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51313216439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 405047 + ... + 516419.

It is an arithmetic number, because the mean of its divisors is an integer number (2030125272).

Almost surely, 2^51313216409 is an apocalyptic number.

It is an amenable number.

51313216409 is a deficient number, since it is larger than the sum of its proper divisors (13650792295).

51313216409 is a wasteful number, since it uses less digits than its factorization.

51313216409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111537.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 51313216409 in words is "fifty-one billion, three hundred thirteen million, two hundred sixteen thousand, four hundred nine".