51213958139 has 16 divisors (see below), whose sum is σ = 54032313600. Its totient is φ = 48408048864.

The previous prime is 51213958127. The next prime is 51213958163. The reversal of 51213958139 is 93185931215.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51213958139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51213958093 and 51213958102.

It is not an unprimeable number, because it can be changed into a prime (51213958109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27284069 + ... + 27285945.

It is an arithmetic number, because the mean of its divisors is an integer number (3377019600).

Almost surely, 2^51213958139 is an apocalyptic number.

51213958139 is a deficient number, since it is larger than the sum of its proper divisors (2818355461).

51213958139 is a wasteful number, since it uses less digits than its factorization.

51213958139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402.

The product of its digits is 291600, while the sum is 47.

The spelling of 51213958139 in words is "fifty-one billion, two hundred thirteen million, nine hundred fifty-eight thousand, one hundred thirty-nine".