51025231997 has 2 divisors, whose sum is σ = 51025231998. Its totient is φ = 51025231996.

The previous prime is 51025231991. The next prime is 51025232021. The reversal of 51025231997 is 79913252015.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33063603556 + 17961628441 = 181834^2 + 134021^2 .

It is a cyclic number.

It is not a de Polignac number, because 51025231997 - 2¹⁴ = 51025215613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51025231991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25512615998 + 25512615999.

It is an arithmetic number, because the mean of its divisors is an integer number (25512615999).

Almost surely, 2^51025231997 is an apocalyptic number.

It is an amenable number.

51025231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51025231997 is an equidigital number, since it uses as much as digits as its factorization.

51025231997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 51025231997 in words is "fifty-one billion, twenty-five million, two hundred thirty-one thousand, nine hundred ninety-seven".