51034978387 has 2 divisors, whose sum is σ = 51034978388. Its totient is φ = 51034978386.

The previous prime is 51034978373. The next prime is 51034978427. The reversal of 51034978387 is 78387943015.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51034978387 - 2¹⁹ = 51034454099 is a prime.

It is not a weakly prime, because it can be changed into another prime (51034978087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25517489193 + 25517489194.

It is an arithmetic number, because the mean of its divisors is an integer number (25517489194).

Almost surely, 2^51034978387 is an apocalyptic number.

51034978387 is a deficient number, since it is larger than the sum of its proper divisors (1).

51034978387 is an equidigital number, since it uses as much as digits as its factorization.

51034978387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 51034978387 in words is "fifty-one billion, thirty-four million, nine hundred seventy-eight thousand, three hundred eighty-seven".