51490230997 has 2 divisors, whose sum is σ = 51490230998. Its totient is φ = 51490230996.

The previous prime is 51490230947. The next prime is 51490231027. The reversal of 51490230997 is 79903209415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31910105956 + 19580125041 = 178634^2 + 139929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51490230997 is a prime.

It is a super-2 number, since 2×51490230997² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51490230997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51490230937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25745115498 + 25745115499.

It is an arithmetic number, because the mean of its divisors is an integer number (25745115499).

Almost surely, 2^51490230997 is an apocalyptic number.

It is an amenable number.

51490230997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51490230997 is an equidigital number, since it uses as much as digits as its factorization.

51490230997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 49.

The spelling of 51490230997 in words is "fifty-one billion, four hundred ninety million, two hundred thirty thousand, nine hundred ninety-seven".