51021232387 has 2 divisors, whose sum is σ = 51021232388. Its totient is φ = 51021232386.

The previous prime is 51021232351. The next prime is 51021232433. The reversal of 51021232387 is 78323212015.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51021232387 is a prime.

It is not a weakly prime, because it can be changed into another prime (51021232187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510616193 + 25510616194.

It is an arithmetic number, because the mean of its divisors is an integer number (25510616194).

Almost surely, 2^51021232387 is an apocalyptic number.

51021232387 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021232387 is an equidigital number, since it uses as much as digits as its factorization.

51021232387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 51021232387 in words is "fifty-one billion, twenty-one million, two hundred thirty-two thousand, three hundred eighty-seven".