51215101387 has 2 divisors, whose sum is σ = 51215101388. Its totient is φ = 51215101386.

The previous prime is 51215101291. The next prime is 51215101411. The reversal of 51215101387 is 78310151215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51215101387 - 2¹¹ = 51215099339 is a prime.

It is a super-2 number, since 2×51215101387² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51215101687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25607550693 + 25607550694.

It is an arithmetic number, because the mean of its divisors is an integer number (25607550694).

Almost surely, 2^51215101387 is an apocalyptic number.

51215101387 is a deficient number, since it is larger than the sum of its proper divisors (1).

51215101387 is an equidigital number, since it uses as much as digits as its factorization.

51215101387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 34.

The spelling of 51215101387 in words is "fifty-one billion, two hundred fifteen million, one hundred one thousand, three hundred eighty-seven".