51126023987 has 2 divisors, whose sum is σ = 51126023988. Its totient is φ = 51126023986.

The previous prime is 51126023959. The next prime is 51126024023. The reversal of 51126023987 is 78932062115.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51126023987 is a prime.

It is a super-2 number, since 2×51126023987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51126023917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25563011993 + 25563011994.

It is an arithmetic number, because the mean of its divisors is an integer number (25563011994).

Almost surely, 2^51126023987 is an apocalyptic number.

51126023987 is a deficient number, since it is larger than the sum of its proper divisors (1).

51126023987 is an equidigital number, since it uses as much as digits as its factorization.

51126023987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 51126023987 in words is "fifty-one billion, one hundred twenty-six million, twenty-three thousand, nine hundred eighty-seven".