10129999981 has 2 divisors, whose sum is σ = 10129999982. Its totient is φ = 10129999980.

The previous prime is 10129999961. The next prime is 10130000033. The reversal of 10129999981 is 18999992101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7452868900 + 2677131081 = 86330^2 + 51741^2 .

It is a cyclic number.

It is not a de Polignac number, because 10129999981 - 2¹³ = 10129991789 is a prime.

It is a super-2 number, since 2×10129999981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10129999951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5064999990 + 5064999991.

It is an arithmetic number, because the mean of its divisors is an integer number (5064999991).

Almost surely, 2^10129999981 is an apocalyptic number.

It is an amenable number.

10129999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10129999981 is an equidigital number, since it uses as much as digits as its factorization.

10129999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 944784, while the sum is 58.

The spelling of 10129999981 in words is "ten billion, one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".