10051000505981 has 2 divisors, whose sum is σ = 10051000505982. Its totient is φ = 10051000505980.

The previous prime is 10051000505939. The next prime is 10051000506007. The reversal of 10051000505981 is 18950500015001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9043456330756 + 1007544175225 = 3007234^2 + 1003765^2 .

It is a cyclic number.

It is not a de Polignac number, because 10051000505981 - 2³⁸ = 9776122599037 is a prime.

It is a super-2 number, since 2×10051000505981² (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 (10051000501981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025500252990 + 5025500252991.

It is an arithmetic number, because the mean of its divisors is an integer number (5025500252991).

Almost surely, 2^{10051000505981} is an apocalyptic number.

It is an amenable number.

10051000505981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10051000505981 is an equidigital number, since it uses as much as digits as its factorization.

10051000505981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 35.

The spelling of 10051000505981 in words is "ten trillion, fifty-one billion, five hundred five thousand, nine hundred eighty-one".