10051000501981 has 2 divisors, whose sum is σ = 10051000501982. Its totient is φ = 10051000501980.

The previous prime is 10051000501963. The next prime is 10051000501991. The reversal of 10051000501981 is 18910500015001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8118886601956 + 1932113900025 = 2849366^2 + 1390005^2 .

It is a cyclic number.

It is not a de Polignac number, because 10051000501981 - 2¹³ = 10051000493789 is a prime.

It is a super-2 number, since 2×10051000501981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10051000501991) 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, 5025500250990 + 5025500250991.

It is an arithmetic number, because the mean of its divisors is an integer number (5025500250991).

Almost surely, 2^{10051000501981} is an apocalyptic number.

It is an amenable number.

10051000501981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10051000501981 is an equidigital number, since it uses as much as digits as its factorization.

10051000501981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 31.

Adding to 10051000501981 its reverse (18910500015001), we get a palindrome (28961500516982).

The spelling of 10051000501981 in words is "ten trillion, fifty-one billion, five hundred one thousand, nine hundred eighty-one".