51005449997 has 2 divisors, whose sum is σ = 51005449998. Its totient is φ = 51005449996.

The previous prime is 51005449907. The next prime is 51005450021. The reversal of 51005449997 is 79994450015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36032012041 + 14973437956 = 189821^2 + 122366^2 .

It is a cyclic number.

It is not a de Polignac number, because 51005449997 - 2¹² = 51005445901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51005449907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25502724998 + 25502724999.

It is an arithmetic number, because the mean of its divisors is an integer number (25502724999).

Almost surely, 2^51005449997 is an apocalyptic number.

It is an amenable number.

51005449997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51005449997 is an equidigital number, since it uses as much as digits as its factorization.

51005449997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 51005449997 in words is "fifty-one billion, five million, four hundred forty-nine thousand, nine hundred ninety-seven".